Let's work it out together.
Work through one checkpoint at a time. Your answer area opens after the reasoning.
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Checkpoint 1
Estimate with nearby multiples: 7 × 70 = 490 and 7 × 80 = 560.
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Checkpoint 2
Now find the greatest multiple that does not exceed 491: 7 × 70 = 490.
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Checkpoint 3
Subtract to get 1, then check 7 × 70 + 1 = 491 and 1 < 7.