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Grade 4 Math · World 2: Big Number Bridge · Level 15
Subtract Across Zeros
Solve 50,000 − 23,456.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 15
- What is 50,000 minus 23,456? There are no ones, tens, hundreds, or thousands to take from.
- Break across the zeros: 5 ten thousands becomes 4 ten thousands, 9 thousands, 9 hundreds, 9 tens, and 10 ones. Now every place has enough.
- Here's another way. Take 1 from both numbers: 49,999 minus 23,455 has the same answer, and nothing needs breaking!
- Both ways give 26,544. Check by adding: 26,544 plus 23,456 is 50,000.
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.