457-66

391

Ways to see it:

• 457 − 66 = (457 − 60) − 6 = 397 − 6 = 391
• Or subtract column-wise: 457 − 66 → units: 7−6=1; tens: 5−6 (borrow from 4) → 15−6=9; hundreds: 3−0=3 → 391
• Quick check: 391 + 66 = 457

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