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138 is not prime. 138 = 2 * 3 * 23
8.625 is 6.25 percent of 138. .0625X138 = 8.625
To find 21 percent of a number, multiply the number by 0.21. In this instance, 0.21 x 138 = 28.98. Therefore, 21 percent of 138 is equal to 28.98.
A mixed number
Take sqrt(138) = 11.74734012 times itself = 137.9999999