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Sometimes you can find patterns that make the multiplying easier.

Example: 4 x 7 x 25

If you multiplied in order (4 x 7) x 25, you'd come up with 28 x 25, which isn't that easy to do in your head. If you regroup, (4 x 25) x 7, you come up with 100 x 7, which is easier to get 700 from.

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Q: How is grouping factors helpful when multiplying 3 or more factors?
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