Step 1 of 4 · Estimate, then check
Round each number, add those, then do the exact answer with vertical addition.
Estimate first (rough) · then do the exact addition using vertical columns with carry.
Step 2 of 4 · 348 + 261
Estimate (nearest 100)
300 + 300 = 600
Exact: 609 · Estimate: 600
Close — the estimate confirms our answer ✓
Step 3 of 4 · 487 + 358 (chain carry!)
Estimate (nearest 100)
500 + 400 = 900
Exact: 845 · Estimate: 900
Close ✓
Step 4 of 4 · Your turn
Estimate to the nearest 100.
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Nice work!
You estimated and checked.