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Factor them.

2 x 3 x 5 x 5 x 7 = 1050

5 x 5 x 7 x 7 = 1225

Select the common factors.

5 x 5 x 7 = 175, the GCF

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12y ago
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Q: How do you work out the HCF of 1225 and 1050?
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