6 2 1 7 8 Think, discuss and write 1. The whole numbers are not closed under subtraction. Why? Your subtractions may be like this: -- 4, a whole number ?, not a whole number 1, a whole number ?, not a whole number 5 4 9 3 11 1 1 Take a few examples of your own and confirm a
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120
720
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840
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C
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