Step 1 of 4 · Estimate, then check
Round each number, subtract those, then do the exact answer with vertical subtraction.
Estimate first (rough) · then do the exact subtraction using vertical columns with borrow.
Step 2 of 4 · 482 − 235
Estimate (nearest 100)
500 − 200 = 300
Exact: 247 · Estimate: 300
Close — the estimate confirms our answer ✓
Step 3 of 4 · 602 − 149 (borrow chain!)
Estimate (nearest 100)
600 − 100 = 500
Exact: 453 · Estimate: 500
Close ✓
Step 4 of 4 · Your turn
Estimate to the nearest 100.
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Nice work!
You estimated and checked.