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
The model shows 5 equal copies of 3/6.
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Checkpoint 2
Count selected parts: 5 groups of 3 makes 15 selected 6ths.
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Checkpoint 3
Multiply the numerator by 5; keep the denominator because the part size remains 6ths.