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To simplify matters.

ex... 15 x 23

since 15 is 3 x 5 we can sub.

15 x 23 = (3x5) x 23

= (3) x (5 x 23)

= 3 x 115 easier to multiply by 5 than 15

= 345

There are more reasons in advanced math classes, Trig and Calculus

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12y ago

What else can I help you with?