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Learn›Stage 2›1. Add within 20
Stage 2 · Unit 1 / 7 · Numbers & Operations

Add within 20

From no-carry to carrying sums, adding three numbers, and missing addends.

★ 0 / 12 · 0/4 steps done

▶ Start · Step 1
2

With carrying

For 8 + 7, add 2 to make 10, then add the other 5: 15.

· Not the suggested order
★★★3

Add three numbers

· Not the suggested order
★★★4

Missing number

· Not the suggested order
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← Stage 22. Subtract within 20 →