🚂
Grade 3 Math · World 2: Add-and-Subtract Express · Level 12
Make a New Ten or Hundred
Add when the ones or tens regroup.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 12
- What is 268 plus 157? Add each place: 200 + 100 is 300, 60 + 50 is 110, and 8 + 7 is 15.
- 15 ones is 1 ten and 5 ones, so trade 10 ones for a new ten. 110 is 1 hundred and 1 ten, so trade 10 tens for a new hundred.
- Altogether: 4 hundreds, 2 tens, and 5 ones. 268 + 157 = 425!
Georgia's K-12 Mathematics Standards:
- 3.PAR.2.1 — Fluently add and subtract within 1000 to solve problems.