Math

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?

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  1. 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

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  2. 60-20=20+___

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  3. 40

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  4. 1.6x2,6x and 6x200

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  5. 5*5*5*50,and 5*500

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  6. I need help to

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