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Grade 1 Math · World 5: Hundred Hill · Level 35
Subtracting Tens
70 − 30, and 56 − 20.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 35
- Taking away tens works the same way. 7 minus 3 is 4, so 70 minus 30 is 40.
- Your turn! Tap 2 tens to take them away from 56.
- 5 tens take away 2 tens is 3 tens. The 6 ones stay. 56 minus 20 is 36!
- You can count back by tens too: 56, 46, 36.
- When you take away tens, only the tens change.
Georgia's K-12 Mathematics Standards:
- 1.NR.5.3 — Add and subtract multiples of 10 within 100.
- 1.NR.5.1 — Use a variety of strategies to solve applicable, mathematical addition and subtraction problems with one- and two-digit whole numbers.