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For certain kinds of two-digit numbers, there is a shortcut to find their product. 25-25 = 625 37-33 = 1,221 22-28 = 616 76-74

For certain kinds of two-digit numbers, there is a shortcut to find their product. 25-25 = 625 37-33 = 1,221 22-28 = 616 76-74 = 5,624 (a) Determine the kinds of numbers for which this shortcut works. (b) Describe the procedure as though to someone on the phone.

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