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If you cut a 4x4 piece of paper into four 1x4 strips, you've made three cuts. To cut each 1x4 strip into four 1x1 squares you make three cuts per piece, so another 12 in total. Add this to the original three and you have 15 as predicted.
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Cutting Paper Squares
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This isn't correct.
If you cut a 4x4 piece of paper into four 1x4 strips, you've made three cuts. To cut each 1x4 strip into four 1x1 squares you make three cuts per piece, so another 12 in total. Add this to the original three and you have 15 as predicted.