Seven and three are both prime numbers, therefore their only factors are one and itself. Nine's factors are 9,1, and 3. 3 Goes into 3 evenly, but doesnt go into 7 evenly. Therefore the only number that fits into 9, 7, and 3 evenly is 1. Hope this helps!
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7 and 31 go into 217 evenly.
1 and 7 do. That makes 7 a 'prime' number.
The HCF of both numbers is 7
They are all prime numbers, so the no whole number goes into 5, 3, and 7 evenly. However, if one assumes that "evenly" means a multiple of 2, and that we can use any number, not just whole numbers, then any fraction of the form 1/2N (where N is any whole number) will go "evenly" into 7, 5, and 3.
i dont know if it counts as a mixed number but 3 should be the answer because 7 goes into 21 EVENLY 3 times and there is nothing left over.