According to a survey, about 50 percent of people prefer dark chocolate over white chocolate. About how many people prefer dark chocolate out of 199 people?
We see that our question is asking us about “how many?” So we know we’re going to be doing some estimation; we’re not looking for the exact answer. We know that 50 percent is equal to one-half. We also know that when we’re working with fractions, we’re working with a part of the whole. In this situation, out of 199 people, we know that 199 people is the whole. So now we need to find out what would be the part. What would be the 50 percent — the one-half — of people preferring dark chocolate out of 199 people?
But before we do that, since we’re estimating, since we’re just doing some rounding, let’s change 199 people to 200 people. This number will be much easier to work with. 50 percent or one-half of 200 would be what? We can multiply the numerator and the denominator by 100. 50 percent of 199 people is about 100.