what numbers can you multipy to get 21 except 3 and 7?

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what numbers can you multipy to get 21 except 3 and 7?

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2007-12-09 05:07:12 · 5 answers · asked by qutgal 1 in Science & Mathematics ➔ Mathematics

5 answers

The prime factorization of 21 is 3 * 7 so the only integers that can be multiplied to get 21 are 1 * 21 and 3 * 7. Now, if you mean rational numbers: well, there are an infinite number of products of rational numbers that generate 21.

2007-12-09 05:14:56 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋

1 and 21

2007-12-09 05:14:42 · answer #2 · answered by Jodester 5 · 0⤊ 0⤋

21 and 1? The only factors of 21 are 3 and 7.

2007-12-09 05:14:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋

10.5 x 2

2007-12-09 05:13:41 · answer #4 · answered by ou812655 2 · 0⤊ 0⤋

4.5 times 5.5?

2007-12-09 05:15:35 · answer #5 · answered by Bob Ganoosh 2 · 0⤊ 0⤋