1, 3, 7 and 21
1 and 3 are the only positive whole numbers that can do all of that.
1, 3, 7 and 21. Four numbers.
1, 3, 7, 21.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
They are: 3 and 7
21
1 ,3 ,7 ,21
1, 3, 7, 21.
The numbers that go into 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84
1, 3, 7, 21.
21
multiples of 63
1 and 7.
The only common factor of all three numbers is 3. (The numbers 21 and 63 share all of the factors of 21 : 1, 3, 7, and 21.)
The numbers that go into 42 are1, 2, 3, 6, 42, 21, 14,
1 and 3.
42 - 10, D16