In math, with fractions, "of" always means the same as "times." So 7/8 of 16 is the same as 7/8 * 16. Make 16 a fraction by putting 1 as its denominator, and you have 7/8 * 16/1. Multiply the numerators and denominators, and you get 112/8. Now reduce. Since both 112 and 8 are even, we know we can divide both by 2 to get 56/4. Still even, let's divide by 2 again. 28/2. One more division, and we get 14/1, which is just 14.
There is an easier way for this specific problem. Since the denominator of 7/8 is a factor of 16, we can change 7/8 to match the denominator to the integer. In this case, 7/8 = 14/16. Here again, we see that 14 is the answer.
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