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
Decompose 57 by place value: 57 = 50 + 7.
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Checkpoint 2
Multiply each part by 9: 50 × 9 and 7 × 9.
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Checkpoint 3
Add the partial products to combine the full area.