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To find the simplest form of 21/35, find the largest common factor. Use it to divide into the numbers in your fraction. The largest common factor is 7. 21/7 = 3 and 35/7 = 5. the simplest form is 3/5. The reason you can do this is if you divide a number by 1 you will get the same number. 9/1 = 9. 21/35 divided by 1 = 21/35. It is also true that 7/7 = 1. So you may simplify by dividing by one ( 7/7 ). You get 21/35 divided by 7/7 = 3/5.

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Q: What is the simplest form of twenty one over thirty five?
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