You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
sqrt(441/625) = sqrt(441)/sqrt(625) = 21/25 = 0.84
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The 9 factors of 441 are 1, 3, 7, 9, 21, 49, 63, 147, and 441. It is a square number (21 x 21), so it has an odd number of factors.The factor pairs of 441 are 1 x 441, 3 x 147, 7 x 63, 9 x 49, and 21 x 21.
No, prime numbers refer to whole numbers, not decimals.
441 = 32 x 72
3 x 3 x 7 x 7 = 441
Factors of 1225: 1 5 7 25 35 49 175 245 1225 Factors of 441: 1 3 7 9 21 49 63 147 441 The GCF of 1225 and 441 is 49