Numbers that can be divided evenly by both 3 and 7 must be multiples of the least common multiple of 3 and 7, which is 21. Therefore, any number that is a multiple of 21 can be divided by both 3 and 7. Examples of such numbers include 21, 42, 63, 84, and so on.
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112
The number is 1.
The GCF of 21, 77, and 84 is 7. First you have to find the lowest common factor, that is able to be divided by all the numbers. E.g. 7 *21/7=3 *77/7=11 *84/7=12 3 and 11 are prime numbers and can therefore not be any divided further. Therefore the answer is 7.
As 315 is ending with a 5 it can be divided by 5 315/5=63 As 6+3=9 then it can be divided by 9 63/9=7 7 is a prime number Then 315 = 32 x 5 x 7
161 can be divided evenly by: 1, 7, 23, 161.