← Back to Class 3🔒
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Class 3 · Topic 2
Addition & Subtraction
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Step 1 · Learn
Read the ideas
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The Hopping Map
Hop the hundreds, tens, then ones.
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Number Smashers
Big sums get easy once you smash them into piles.
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Add It Up
Carry the extra when a column overflows.
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Take It Away
Trade 1 ten for 10 ones when the column is short.
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Missing Numbers
Start at the output and reverse each step.
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Estimating Sums & Differences
296 + 405 is about 300 + 400 = 700.
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Is It Reasonable?
Estimate first, then trust it or doubt it.
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Step 2 · Practice
Try the quests
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Step 3 · Boss Battle
Beat the boss
🛡️ 🛡️ 🛡️ 3 shields — lose all → 60-second cooldown
Round 1
Add It Up
🔒Round 2
Take It Away
🔒Round 3
Missing Numbers
🔒Round 4
Estimating Sums & Differences
🔒Round 5
Is It Reasonable?
🔒Round 6
The Hopping Map
🔒Round 7
Number Smashers
🔒Round 8
Missing Numbers
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