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Grade 4 Math · World 2: Big Number Bridge · Level 16
Choose a Strategy
Use friendly numbers, counting up, or adding to check.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 16
- There's more than one way to add and subtract. Pick the one that fits the numbers!
- 29,998 is just 2 away from 30,000. Move 2 from 14,357 to 29,998: it becomes 30,000 plus 14,355. That's 44,355!
- When two numbers are close, count up. 40,003 minus 39,988: from 39,988 to 40,000 is 12, and 3 more is 15.
- Check a subtraction by adding. If 52,000 minus 18,450 is 33,550, then 33,550 plus 18,450 should be 52,000. It is!
Georgia's K-12 Mathematics Standards:
- 4.NR.2.1 — Fluently add and subtract multi-digit numbers to solve practical, mathematical problems using place value understanding, properties of operations, and relationships between operations.