To find the LCM, first, find the prime factorization of each number:
280 = 2 * 2 * 2 * 5 * 7
392 = 2 * 2 * 2 * 7 * 7
Group the like prime factors (the ones in bold italics)
2 * 2 * 2 * 5 * 7 * 7 = 1960
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392
Expressed as a surd, sqrt(392) = 14 sqrt(2). Expressed as a decimal, rounded to two decimal places, sqrt(392) = ±19.80
A = L x W A= 392 and L = 2W 392 = 2W x W 392 = 2W2 392/2 = 2W2/2 196 = W2 14 = W L = 2(W) L = 2(14) L = 28 So the dimensions of a room that has an area of 392 square feet and the Length is twice as big as the width calculates a Length of 28 feet and a width of 14 feet.
196, 392, 588 and so on.
The LCM is: 84