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Grade 2 Math · World 3: Hundred Harbor · Level 24
Tens with Tens, Ones with Ones
Break apart by place value: 34 + 25 = 50 + 9.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 24
- To add 34 and 25, break both numbers into tens and ones.
- Add the tens first: 30 plus 20 is 50.
- Then add the ones: 4 plus 5 is 9.
- Put them together: 50 plus 9 is 59!
- You can do it in your head, too. 42 plus 36: 40 plus 30 is 70, and 2 plus 6 is 8. That's 78!
Georgia's K-12 Mathematics Standards:
- 2.NR.2.4 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.