Class 3 · Topic 1
Numbers & Place Value
Step 1 · Learn
Read the ideas
- 🏠Free
The Place Value House
Where a digit stands decides what it is worth.
- 🔤Free
Number Names & Expanded Form
A sign, a cheque and a sum: one number in three outfits.
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Odd & Even
Seven sweets, two friends: who gets the extra one?
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Roman Numbers
I, V, X, L, C, learn the Roman number code.
- 📊Free
Number Line-Up
Compare digits left-to-right to order numbers.
- 🏗️Free
Building Numbers
Four digit cards, one rule, and a trap with 0.
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The Abacus
Each rod is a place value, read and build any number.
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Rounding
Is it nearer the ten below or the ten above?
Step 2 · Practice
Try the quests
Step 3 · Boss Battle
Beat the boss
🛡️ 🛡️ 🛡️ 3 shields — lose all → 60-second cooldown
Round 1
A dial on the first lock reads 4,738.A dial on the first lock reads 4,738.
FreeRound 2
Lock 2 has a voice-keypad. It whispers a number in words: 'eight thousand and seventy'.Lock 2 has a voice-keypad. It whispers a…
FreeRound 3
Lock 3 shows four crystals numbered 4,573, 5,316, 5,742 and 6,821.Lock 3 shows four crystals numbered 4,573,…
FreeRound 4
Lock 4 is sealed with a Roman crest: XXIV + XL.Lock 4 is sealed with a Roman crest: XXIV +…
FreeRound 5
Lock 5 holds five crystals numbered 5,214, 5,412, 5,123, 5,241 and 5,132. The Guardian says: 'The real crystal is the second-smallest EVEN number.'Lock 5 holds five crystals numbered 5,214,…
FreeRound 6
Lock 6 spins with four number-tiles: 5, 8, 2, 9. The Guardian growls: 'Only the greatest ODD number opens me.'Lock 6 spins with four number-tiles: 5, 8,…
FreeRound 7
Lock 7 glows with an abacus.Lock 7 glows with an abacus.
FreeRound 8
The final dial shows the crowd rounded to the nearest 100: 3,500 fans.The final dial shows the crowd rounded to…
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