Learn through play
Maths, science, English and grammar explained simply, with examples and lists.
GuideInteractive Whiteboard Games: 6 Free Browser Games for Class
Smartboard games that open in the board's browser and play by tap and drag: what each one asks of the class, and how to set the board up.
GuideThe 10 Types of Clouds and How to Spot Each One in the Sky
How clouds form, the ten main cloud types in three height groups, a checklist to recognize them from the ground, what clouds cannot tell you and a sky diary to try this week.
By Polarzinho ·
GuideTypes of Soil: Find Yours With Your Hands and a Glass Jar
Sand, silt, clay and loam, the layers of soil, a hand test, a jar test, drainage and pH in plain words, and how Brazil names its soils.
By Polarzinho ·
GuideVertebrates and Invertebrates: Who Has a Backbone and Who Doesn't
Vertebrates and invertebrates made simple: the five vertebrate groups with examples, the main invertebrate groups, how to tell them apart and a quiz on the animal kingdom.
By Polarzinho ·
GuideAdverbs: types, examples and -ly words
What adverbs are, the types (manner, time, place, frequency and degree), how -ly adverbs work, tricky exceptions and good versus well.
By Polarzinho ·
GuideAnimals in Spanish: List With el and la
35 animals in Spanish with the translation, which ones use el and which use la, how to make plurals and example sentences.
By Polarzinho ·
GuideOxymoron, antithesis and paradox examples
What an oxymoron, an antithesis and a paradox are, how to tell them apart, easy examples of each and some famous logical paradoxes.
By Polarzinho ·
GuideOpposite words: 70 antonyms for kids
What antonyms are, how they differ from synonyms, antonyms made with prefixes and a list of 70 opposite word pairs for kids and learners.
By Polarzinho ·
GuideArea and Perimeter: Formulas for Common Shapes
The difference between area and perimeter, the formulas for a square, rectangle, triangle, parallelogram, trapezoid and circle, worked examples, units (cm and cm²) and common mistakes.
By Polarzinho ·
GuideArticles in English: a, an and the
When to use a, an and the, why it is "an hour" but "a university", when to use no article at all and the common place-name rules.
By Polarzinho ·
GuideBody Parts in Spanish: List With el and la
32 body parts in Spanish with the translation, el or la, plurals like los pies and los dientes, and how to say something hurts.
By Polarzinho ·
GuideColors in Spanish: List With Pronunciation
Colors in Spanish with the translation, where the color goes in a sentence (after the noun), how colors change for masculine and feminine and examples.
By Polarzinho ·
GuideConjunctions: FANBOYS, types and examples
What conjunctions are, coordinating conjunctions (FANBOYS), subordinating and correlative conjunctions, with examples and a comma tip.
By Polarzinho ·
GuideConsonant blends: L, R and S blends list
What consonant blends are, the difference from digraphs, and word lists for L blends, R blends, S blends and three-letter blends.
By Polarzinho ·
GuideConstellations: Names, Shapes and How to Find Them
What a constellation is, how many there are, famous ones like Orion, the Big Dipper and the Southern Cross, the zodiac constellations and tips for finding them.
By Polarzinho ·
GuideDays of the Week and Months in Spanish
The days of the week and the months of the year in Spanish, with pronunciation tips, where the names come from and how to say "on Monday".
By Polarzinho ·
GuideDecimals: Reading, Comparing and Doing the Math
What decimals are, the place values (tenths, hundredths, thousandths), how to read, compare, add and multiply them, and how to turn a fraction into a decimal, with worked examples.
By Polarzinho ·
GuideDivisibility Rules From 2 to 11 With Examples
The rules to tell whether a number is divisible by 2, 3, 4, 5, 6, 8, 9, 10 and 11 without dividing, with worked examples, a sample table and a trick to remember them.
By Polarzinho ·
GuideEuphemism examples: 30 gentle ways to say it
What a euphemism is, why we use them, how they differ from hyperbole and dysphemism, and 30 everyday euphemism examples sorted by topic.
By Polarzinho ·
GuideFamily Words in Spanish: List With el and la
25 family and friend words in Spanish with the translation, el or la, the masculine plural for mixed groups (los padres, los hermanos) and example sentences.
By Polarzinho ·
GuideFigurative language: 12 types with examples
The main types of figurative language with easy examples: simile, metaphor, personification, hyperbole, idiom, alliteration, oxymoron and more.
By Polarzinho ·
GuideFood Chain: Levels, Examples and How It Works
What a food chain is, the levels (producers, consumers and decomposers), which way the arrows point, easy examples, food webs and the 10% energy rule.
By Polarzinho ·
GuideFractions: Types, Simplifying and How to Add Them
What a fraction is, numerator and denominator, how to read fractions, types of fractions, equivalent fractions and how to simplify, add, multiply and divide them.
By Polarzinho ·
GuideFruits in Spanish: List With el and la
28 fruits in Spanish with the translation, which ones use el and which use la, regional differences, how to form the plural and example sentences.
By Polarzinho ·
Guide2D and 3D Shapes: Names, Sides and Examples
Shape names for flat and solid shapes: polygons by number of sides, types of triangles, faces, edges and vertices of 3D shapes, and everyday examples.
By Polarzinho ·
GuideBig words: 40 hard words and what they mean
Big words with simple meanings, plus the hardest words to spell and to say in English. Perfect for building your vocabulary.
By Polarzinho ·
GuideHomophones, Homographs and Homonyms: Examples
The difference between homophones, homographs and homonyms, with easy examples like to, too and two, their, there and they're, and bat and bat.
By Polarzinho ·
GuideHow to Calculate a Percentage: Easy Formulas
What a percentage is, the three calculations you need most (X% of a number, what percent one number is of another, and discounts or increases), mental tricks and examples.
By Polarzinho ·
GuideHyperbole examples: 30 funny exaggerations
What hyperbole is, why we use it, how it differs from lying and understatement, and 30 hyperbole examples from daily life, school and gaming.
By Polarzinho ·
GuideInterjections: Meaning, List and Examples
What an interjection is, a list grouped by feeling (joy, surprise, pain, relief, disgust), how to punctuate them and how they differ from onomatopoeia.
By Polarzinho ·
GuideTypes of irony: verbal, situational, dramatic
The three types of irony explained with easy examples, plus the difference between irony and sarcasm, with examples from daily life, movies and games.
By Polarzinho ·
GuideLayers of the Earth: Crust, Mantle and Core
The layers of the Earth, from crust to inner core: thickness, temperature, solid or liquid, the lithosphere and asthenosphere, the deepest hole ever drilled and a hard-boiled egg model.
By Polarzinho ·
GuideLCM and GCF: What They Are and How to Find Them
What multiples and factors are, how to find the LCM and GCF (by listing and by prime factorization), how they relate, worked examples and what they are used for.
By Polarzinho ·
GuideHow Do Magnets Work? Poles, Types and Fun Facts
What a magnet is, how it works, north and south poles, which metals are magnetic, the types of magnets, electromagnets and a homemade compass you can make.
By Polarzinho ·
GuideMetaphor examples: 30 easy ones explained
What a metaphor is, how it differs from a simile, and 30 metaphor examples from everyday life, school and video games, each with its meaning.
By Polarzinho ·
GuideMoon Phases: Names, Order and How They Work
The eight moon phases in order, why the Moon changes shape, how long the cycle lasts, how hemispheres differ and an experiment with a flashlight and a ball.
By Polarzinho ·
GuideMultiplication Table 1 to 10 and Tricks to Learn It
The full multiplication table from 1 to 10, finger and pattern tricks for the 9s, 5s and 6s, the hardest facts and a way to cut what you need to memorize in half.
By Polarzinho ·
GuideMusic Notes: Names, Letters and How to Read Them
The seven notes (C, D, E, F, G, A, B), their solfège names, sharps and flats, how to read notes on the staff and how long each note value lasts.
By Polarzinho ·
GuideNumbers in Spanish 1 to 100: List and Rules
The numbers in Spanish from 0 to 100, how to form 31 to 99 with "y", the special numbers from 16 to 29, hundreds like quinientos and examples to practice.
By Polarzinho ·
GuideOnomatopoeia examples: 50 sound words
What onomatopoeia is, how it differs from interjections and 50 examples of animal sounds, object sounds, nature sounds and people sounds.
By Polarzinho ·
GuideOrdinal Numbers: 1st to 100th List and Rules
What ordinal numbers are, the full list from first to one hundredth in words, the 1st, 2nd, 3rd suffix rule, the tricky spellings and how they differ from cardinal numbers.
By Polarzinho ·
GuideParts of a Plant and What Each One Does
Roots, stem, leaves, flower, fruit and seed: what each part of a plant does, the parts of a flower, the two kinds of roots and which part you eat in common foods.
By Polarzinho ·
GuideThe 8 parts of speech, with examples
The 8 parts of speech in English with simple definitions and examples: noun, pronoun, verb, adjective, adverb, preposition, conjunction and interjection.
By Polarzinho ·
GuidePeriodic Table: Elements, Symbols and Groups
What the periodic table is, how many elements there are (118), periods and groups, the families (alkali metals, halogens, noble gases), the first 20 elements and symbols from Latin like Fe and Au.
By Polarzinho ·
GuidePersonification examples: 30 easy ones
What personification is, how to spot it and 30 personification examples from nature, everyday objects and video games, with what each one means.
By Polarzinho ·
GuidePhotosynthesis: How It Works and the Equation
What photosynthesis is, where it happens (chloroplasts and chlorophyll), what a plant needs, what it makes, the balanced chemical equation and a bean experiment.
By Polarzinho ·
GuidePleonasm and redundancy: 20 examples to avoid
What a pleonasm is, when redundancy is useful for emphasis, and 20 redundant phrases in everyday English worth cutting.
By Polarzinho ·
GuidePrepositions: place, time and movement list
What prepositions are, with lists of prepositions of place, time and movement, the in, on and at rules, and common mistakes to avoid.
By Polarzinho ·
GuidePrime Numbers 1 to 100: List and How to Find Them
What prime numbers are, the full list from 1 to 100, why 1 is not prime, the Sieve of Eratosthenes, divisibility tricks and fun facts about primes.
By Polarzinho ·
GuideProfessions in Spanish: 32 Jobs With el and la
32 professions in Spanish with the el or la form, the ones that never change, why you say "Soy profesor" with no article, how to ask what someone does and the librería trap.
By Polarzinho ·
GuidePronouns: types, list and examples
What pronouns are, personal subject and object pronouns, possessive, reflexive, demonstrative, interrogative, relative and indefinite pronouns, with examples.
By Polarzinho ·
GuideRoman Numerals: Chart 1-100 and How to Convert
The seven symbols (I, V, X, L, C, D and M), the adding and subtracting rules, a chart from 1 to 100, thousands, years like 2026 and an easy way to convert any number.
By Polarzinho ·
GuideRule of Three: Direct and Inverse Proportion
What the rule of three is, how to solve direct and inverse proportion problems, how to tell which one to use, worked examples with prices, recipes and time, and common mistakes.
By Polarzinho ·
GuideThe Four Seasons: Dates, Causes and Facts
The four seasons, why they happen (the tilt of the Earth), the dates in the Northern Hemisphere, how the Southern Hemisphere is the opposite and a very common myth.
By Polarzinho ·
GuidePlanets in Order From the Sun, With Fun Facts
The 8 planets in order from the Sun, a trick to remember them, rocky planets and giants, biggest to smallest, what happened to Pluto and one fun fact about each planet.
By Polarzinho ·
Guide50 States and Capitals: Full List A to Z
All 50 US state capitals in alphabetical order, the capitals people always get wrong, fun facts and a trick for using capitals in Stop and other word games.
By Polarzinho ·
GuideTypes of syllables and syllable stress
The six types of syllables with examples, how to find the stressed syllable and why record and record can sound different.
By Polarzinho ·
GuideOne, two and three syllable words: lists
How to count syllables, lists of one, two, three and multisyllabic words, and simple rules for dividing words into syllables.
By Polarzinho ·
GuideSynonyms: What They Are and 46 Examples
What synonyms are, 46 synonym examples for adjectives, verbs and nouns, why context matters and how synonyms make your writing better.
By Polarzinho ·
GuideTraffic Signs and Meanings: Shapes and Colors
The main types of traffic signs in the US (regulatory, warning and guide), what each shape and color means, the most common signs, traffic lights and road markings.
By Polarzinho ·
GuideTypes of Angles: Acute, Right, Obtuse and Straight
What an angle is, how to measure it with a protractor, the types of angles (zero, acute, right, obtuse, straight, reflex and full), complementary and supplementary angles and clock examples.
By Polarzinho ·
GuideTypes of Energy: Examples and Transformations
The main types of energy (kinetic, potential, thermal, chemical, electrical, light, sound and nuclear), everyday examples, how energy changes form and renewable sources.
By Polarzinho ·
GuideTypes of Rocks: Igneous, Sedimentary and Metamorphic
The three types of rocks, how each one forms, examples like granite, basalt, sandstone and marble, the rock cycle, minerals versus ores and the Mohs hardness scale.
By Polarzinho ·
GuideVerbs: action, linking and helping verbs list
What verbs are, with lists of action verbs, linking verbs and helping verbs, plus regular and irregular verbs in the past tense.
By Polarzinho ·
GuideVerbs in Spanish: -ar, -er and -ir Conjugation
How Spanish verbs work: the three endings (-ar, -er, -ir), present tense conjugation of regular verbs, the essential irregular verbs ser, ir and tener, and verbs from games.
By Polarzinho ·
GuideWhat are vowels? Short, long and vowel teams
What vowels are, short and long vowel sounds, the silent E rule, vowel teams and diphthongs, with easy word lists for kids and learners.
By Polarzinho ·
GuideThe Water Cycle: Stages and Simple Explanation
The water cycle in simple stages: evaporation, condensation, precipitation and collection, the three states of water, state changes and an easy experiment at home.
By Polarzinho ·
GuideCommon and proper nouns, and other noun types
What a noun is, common and proper nouns, concrete and abstract, countable and uncountable, compound nouns and a list of collective nouns.
By Polarzinho ·
GuideList of adjectives: examples, types and order
What an adjective is, a big list of adjectives by category, the types of adjectives, the order of adjectives and comparatives and superlatives.
By Polarzinho ·
GuideWords that start with B and V, with meanings
Words that start with B and V for kids and grown-ups: easy words first, then bigger words with simple meanings.
By Polarzinho ·
GuideWords That Start With F, Plus PH and GH Words
Words that start with F for kids and word games, FL and FR words, and the other spellings of the F sound: PH like in phone and GH like in laugh.
By Polarzinho ·
GuideWords that start with G and J, plus soft G words
Words that start with G and J for kids and grown-ups, with simple meanings, and the rule for hard G and soft G, like game and giraffe.
By Polarzinho ·
GuideDigraphs: words with CH, SH, TH, PH and WH
What a digraph is, with easy word lists for CH, SH, TH, PH and WH, plus words that start with H and the sneaky silent H.
By Polarzinho ·
GuideWords that start with K, W and Y, with meanings
Words that start with K, W and Y for kids and grown-ups, with short meanings, plus tips for word games where these letters come up.
By Polarzinho ·
GuideWords That Start With L, Plus Silent L Words
Words that start with L for kids and word games, double L words, words where the L is silent (walk, half, could) and L answers for Stop.
By Polarzinho ·
GuideWords that start with M and N, with meanings
Words that start with M and N for kids and grown-ups, bigger words with simple meanings, positive M and N words and the sneaky silent N.
By Polarzinho ·
GuideWords That Start With P, Plus Silent P Words
Words that start with P for kids and word games, PL and PR words, words where the P is silent (psychology, receipt) and P answers for Stop.
By Polarzinho ·
GuideWords That Start With Q: Q Words With and Without U
Q words for kids and word games: words that start with Q, words with Q in the middle, why Q is almost always followed by U and the few words where it is not.
By Polarzinho ·
GuideWords that start with S, plus positive S words
Words that start with S for kids and grown-ups, bigger S words with simple meanings and a list of positive words that start with S.
By Polarzinho ·
GuideDouble letter words, plus words with QU and CK
Words with double letters, words with QU and words with CK for kids and spellers, with the simple rules that explain when to use each one.
By Polarzinho ·
GuideWords That Start With T, Plus TH and Silent T
Words that start with T for kids and word games, the two sounds of TH (think and this), words with a silent T (listen, castle) and T answers for Stop.
By Polarzinho ·
GuideWords that start with X and Z, with meanings
Words that start with X and Z for kids and grown-ups, the surprising way X sounds at the start of a word, and words with X inside.
By Polarzinho ·