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Myriora Maths

Short animated maths lessons for children and the grown-ups helping them: from what a number is, all the way to 11+ tricks. Every lesson explains why, not just how, then gives a question to try.

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From first numbers to algebra, one idea per lesson, in the order children meet them at school. Start at lesson 1 if your child is new to it, or aged 5–7, or open any chapter below.

Start lesson 1: What is a number?

11+ preparation

Getting ready for the 11+

The tricks and problem types that turn up in 11+ maths papers, one per lesson. Best from Year 4 or 5, ages 9–11.

See the 11+ lessons

1 Foundations ages 5–11

One idea per lesson, in the order children meet them at primary school, from what a number is to algebra.

Chapter 1 Numbers and place value Ages 5–9 · 9 lessons
  1. 1What is a number?Ages 5–7
  2. 2Ones, tens and hundredsAges 5–7
  3. 3Bigger or smaller?Ages 5–7
  4. 4The number lineAges 5–7
  5. 5Odd and evenAges 5–7
  6. 6Really big numbersAges 7–9
  7. 7RoundingAges 7–9
  8. 8Below zeroAges 7–9
  9. 9Roman numeralsAges 7–9
Chapter 2 Adding Ages 5–9 · 7 lessons
  1. 1What adding meansAges 5–7
  2. 2Number bonds to 10 and 20Ages 5–7
  3. 3Adding in your headAges 5–7
  4. 4Column additionAges 7–9
  5. 5Order doesn't matterAges 7–9
  6. 6Adding lots of numbers fastAges 7–9
  7. 7Is my answer sensible?Ages 7–9
Chapter 3 Taking away Ages 5–9 · 5 lessons
  1. 1Take away or difference?Ages 5–7
  2. 2Fact familiesAges 5–7
  3. 3Counting upAges 7–9
  4. 4Column subtractionAges 7–9
  5. 5Clever subtractionAges 7–9
Chapter 4 Multiplying Ages 5–11 · 10 lessons
  1. 1Equal groupsAges 5–7
  2. 2Times tables: 2, 5, 10Ages 5–7
  3. 3Times tables: 3, 4, 6, 8Ages 7–9
  4. 4Times tables: 7, 9, 11, 12Ages 7–9
  5. 5× 10, × 100, × 1000Ages 7–9
  6. 6Doubling and halvingAges 7–9
  7. 7The grid methodAges 7–9
  8. 8Long multiplicationAges 9–11
  9. 9Mental multiplication tricksAges 9–11
  10. 10Why it works: the distributive lawAges 9–11
Chapter 5 Dividing Ages 5–11 · 7 lessons
  1. 1Sharing and groupingAges 5–7
  2. 2Division undoes multiplicationAges 5–7
  3. 3RemaindersAges 7–9
  4. 4Short divisionAges 7–9
  5. 5÷ 10, ÷ 100, ÷ 1000Ages 7–9
  6. 6Long divisionAges 9–11
  7. 7Divisibility rulesAges 9–11
Chapter 6 Factors, multiples and primes Ages 7–11 · 12 lessons
  1. 1Factors and factor pairsAges 7–9
  2. 2MultiplesAges 7–9
  3. 3Prime numbersAges 7–9
  4. 4Why isn't 1 prime?Ages 7–9
  5. 5Factor treesAges 7–9
  6. 6Square numbers and square rootsAges 7–9
  7. 7Cube numbersAges 7–9
  8. 8Highest common factorAges 9–11
  9. 9Lowest common multipleAges 9–11
  10. 10How many factors?Ages 9–11
  11. 11Bonus: what is a number made of?Ages 9–11
  12. 12Bonus: simplify with gemsAges 9–11
Chapter 7 Order of operations and powers Ages 7–11 · 5 lessons
  1. 1Which comes first? (BIDMAS)Ages 7–9
  2. 2The power of bracketsAges 7–9
  3. 3PowersAges 9–11
  4. 4Powers of tenAges 9–11
  5. 5Power rules for the curiousAges 9–11
Chapter 8 Negative numbers Ages 7–11 · 3 lessons
  1. 1Adding and subtracting negativesAges 7–9
  2. 2Negative times negativeAges 9–11
  3. 3Negative numbers in real lifeAges 7–9
Chapter 9 Fractions Ages 5–11 · 11 lessons
  1. 1What is a fraction?Ages 5–7
  2. 2Unit fractionsAges 5–7
  3. 3Equivalent fractionsAges 7–9
  4. 4Simplifying fractionsAges 7–9
  5. 5Comparing fractionsAges 7–9
  6. 6Mixed numbersAges 7–9
  7. 7Adding and subtracting fractionsAges 7–9
  8. 8Fraction of an amountAges 7–9
  9. 9Multiplying fractionsAges 9–11
  10. 10Dividing fractionsAges 9–11
  11. 11Finding the wholeAges 9–11
Chapter 10 Decimals Ages 7–11 · 5 lessons
  1. 1Tenths and hundredthsAges 7–9
  2. 2Which decimal is bigger?Ages 7–9
  3. 3Adding and subtracting decimalsAges 7–9
  4. 4Multiplying and dividing decimalsAges 9–11
  5. 5Fractions to decimalsAges 9–11
Chapter 11 Percentages Ages 7–11 · 5 lessons
  1. 1What does per cent mean?Ages 7–9
  2. 2Percentages of amountsAges 7–9
  3. 3Fractions, decimals, percentagesAges 9–11
  4. 4Increase and decreaseAges 9–11
  5. 5Going backwardsAges 9–11
Chapter 12 Ratio and proportion Ages 7–11 · 6 lessons
  1. 1What is a ratio?Ages 7–9
  2. 2Simplifying ratiosAges 9–11
  3. 3Sharing in a ratioAges 9–11
  4. 4Recipes and the unitary methodAges 7–9
  5. 5Scale and mapsAges 9–11
  6. 6When the ratio changesAges 9–11
Chapter 13 First steps in algebra Ages 5–11 · 6 lessons
  1. 1The missing numberAges 5–7
  2. 2Letters for numbersAges 7–9
  3. 3FormulasAges 7–9
  4. 4Solving equations with a balanceAges 9–11
  5. 5SequencesAges 9–11
  6. 6Two unknownsAges 9–11
Chapter 14 Measures Ages 5–11 · 11 lessons
  1. 1Measuring length, mass and capacityAges 5–7
  2. 2Money and changeAges 5–7
  3. 3Telling the timeAges 5–7
  4. 424-hour clock and timetablesAges 7–9
  5. 5Converting unitsAges 7–9
  6. 6Imperial unitsAges 7–9
  7. 7PerimeterAges 7–9
  8. 8Area of rectanglesAges 7–9
  9. 9Area of triangles and parallelogramsAges 9–11
  10. 10Volume of cuboidsAges 9–11
  11. 11Speed, distance, timeAges 9–11
Chapter 15 Shape and space Ages 5–11 · 10 lessons
  1. 12D shapesAges 5–7
  2. 23D shapes and netsAges 7–9
  3. 3AnglesAges 7–9
  4. 4Angle factsAges 9–11
  5. 5Angles in polygonsAges 9–11
  6. 6CirclesAges 7–9
  7. 7CoordinatesAges 7–9
  8. 8Symmetry and reflectionAges 7–9
  9. 9TranslationAges 7–9
  10. 10Parallel and perpendicularAges 7–9
Chapter 16 Statistics and chance Ages 5–11 · 7 lessons
  1. 1Tally charts and pictogramsAges 5–7
  2. 2Bar charts and line graphsAges 7–9
  3. 3Venn and Carroll diagramsAges 7–9
  4. 4Mean, median, mode, rangeAges 7–9
  5. 5Pie chartsAges 9–11
  6. 6Mean puzzlesAges 9–11
  7. 7Chance and probabilityAges 9–11

2 11+ preparation ages 9–11

The puzzles, shortcuts and problem types that turn up in 11+ papers, one per lesson.

Chapter 1 Speed tricks 11+ · 7 lessons
  1. 1Adding 1 to 100 in seconds11+
  2. 2Adding any run of numbers11+
  3. 3Odd numbers make squares11+
  4. 4× 5, × 25, × 9911+
  5. 5Squaring numbers that end in 511+
  6. 6The percentage swap11+
  7. 7Last digits11+
Chapter 2 Classic word problems 11+ · 13 lessons
  1. 1Heads and legs11+
  2. 2Sum and difference11+
  3. 3Age problems11+
  4. 4Consecutive numbers11+
  5. 5Fence posts and gaps11+
  6. 6Working backwards11+
  7. 7Fractions of what's left11+
  8. 8Working together11+
  9. 9Meeting and chasing11+
  10. 10What day will it be?11+
  11. 11Clock angles11+
  12. 12Remainder puzzles11+
  13. 13Coins and making amounts11+
Chapter 3 Counting and logic 11+ · 8 lessons
  1. 1The handshake puzzle11+
  2. 2Counting shapes11+
  3. 3Listing systematically11+
  4. 4Page numbers and digits11+
  5. 5Missing digits11+
  6. 6Magic squares11+
  7. 7Logic grids11+
  8. 8Matchstick patterns11+
Chapter 4 Shape puzzles 11+ · 4 lessons
  1. 1Shaded areas11+
  2. 2The painted cube11+
  3. 3Hidden angles11+
  4. 4Nets and folding11+
Chapter 5 Exam skills 11+ · 4 lessons
  1. 1Read the question twice11+
  2. 2Estimate before you calculate11+
  3. 3Managing your time11+
  4. 4Checking your answers11+

Start with: Adding 1 to 100 in seconds.

Practice and games

PracticePick the topics you have watched and get 10 or 20 new questions, with the working for anything missed.Practise › Guides for parentsLonger write-ups for grown-ups: prime factors, HCF and LCM, divisibility rules, with worked examples.Read the guides › Factor GemsOur number puzzle: match gems that share a prime factor. The first island is free in your browser.Play free ›

How to use a lesson

  1. Watch together. Each video is a few minutes long.
  2. Pause at "Your turn". Say the answer out loud before the video does.
  3. Practise straight after. Ten fresh questions under the video, with a score.

Progress and ticks are kept in this browser only: nothing is sent anywhere, and there is nothing to sign up for.