There are many ways to cut 6 x 13. Here is one way:
6 x 13 = 5 x 10 + 5 x 3 + 1 x 10 + 1 x 3

= 50 + 15 + 10 + 3

= 78

Using the brackets, the cutting up of 6 x 13 would be:
6 x 13 = (5 + 1) x (10 + 3)

= 5 x 10 + 5 x 3 + 1 x 10 + 1 x 3

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