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March 28, 2017

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My son's math homework asks him to find each product by factoring the tens. 6 x 2, 6 x 20 and 60 x 20. There is no explaination in the book..can you help?

  • Math - ,

    Factoring the tens is a technique for mental multiplication which relies on the fact that 10*n, for any real number n, is easy to compute.

    6*2 = 12 is a memory value.

    6*20 = 6*2*10 = 12*10 = 120
    60*20 = 6*10*2*10 = 12*10*10 = 1200

  • Math - ,

    60-20=20+___

  • Math - ,

    40

  • Math - ,

    1.6x2,6x and 6x200

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