Double of 39 is 78. When you double a number, you are multiplying it by 2. In this case, 39 multiplied by 2 equals 78.
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The difference between a single and double is that a single mattresses is 39 inches wide and 75 inches long. Double mattresses is 15 inches wider at 54 inches wide and 75 inches long.
Factors of 39 are 1, 3, 13, 39. Whereas the prime factors of 39 are 3, 13, 39.
(39 x 26) + (39 x 13) = 39 x 39 = 1521
39 out of 100 = 39%
No. 39 = 3 * 13 39=3 so in that case 39 is not a prime number