1, 3, 7, 21.
1, 3, 7 and 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 has two prime factors.
1 and 3.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.
The numbers that go into 21 evenly are 1, 3, 7, 21.
1, 3, 7, 9, 21, 63.
1, 3, 7, 9, 21, 63.
1, 3, 7, 9, 21 and 63.
6
7x3 = 21 All numbers from 1-400 (399 total) that are factors of 21: 399/21 = 19
It would be 6 think about it
20: 1, 2, 5, 10, 20 21: 1, 3, 7, 21
45
63 ÷ 21 = 3