What are ALL the factors of 441

dont just say 3 and 1 & 441 because i know 21 is another factor.. can you help? :O just list all the ones you know ! thanks

1 and 441 are obvious.

Remember that factors come in PAIRS. Once you find one factor, find the pair.

441 ÷ 3 = 147.
Add 3 and 147 to your list.

Keep dividing each factor to find more factors:

147 ÷ 3 = 49.
441 ÷ 49 = 9.
Add 9 and 49 to your list.

49 ÷ 7 = 7.
441 ÷ 7 = 63.
Add 7 and 63 to your list.

63 ÷ 3 = 21.
441 ÷ 21 = 21.
Add 21 and 21 to your list.

21 divides by 3 and 7, but those are already included in our list. So we are done.


1, 441
3, 147
7, 63
9, 49
21, 21

1, 3, 7, 9, 21, 49, 63, 147, and 441

Pairs: 1 x 441, 3 x 147, 7 x 63, 9 x 49, and 21 x 21

1. 3. 7. 63. And 147. And 21