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Grade 3 Math · World 2: Add-and-Subtract Express · Level 13
Hops and Friendly Numbers
Add with jumps on a number line, or change to an easier problem: 398 + 245 = 400 + 243.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 13
- You can add with hops on a number line. For 356 + 230, start at 356, jump 200, then 30.
- 356, then 556, then 586. 356 + 230 = 586!
- Friendly numbers make adding easier. 398 is just 2 away from 400. Move 2 from 245 to 398: 398 + 245 is the same as 400 + 243.
- 400 + 243 is easy: 643! Use whichever way works best for you.
Georgia's K-12 Mathematics Standards:
- 3.PAR.2.1 — Fluently add and subtract within 1000 to solve problems.