Question

Let's say that you go out for dinner. The meal and the service are excellent. You want to leave a really good tip for the waiter, and you've heard that 20 percent is a really good tip. The total bill for your dinner is $53.82.

Write a paragraph explaining how to quickly estimate that the 20 percent tip rounded to the nearest dollar is $11. Type your answer into a text file.
Math is soooo confusing to me :/

Answer 1

First, to estimate we can round 53.82 up to 55.00. Then you can look at it like this: when you divide 100 by 20 you get 5, so 20% is one fifth of 100. Therefore, we want to find one fifth of $55. To do this, you multiply 55*1/5. When you multiply the numerators by each other and the denominators by each other, you get 55/5. When you divide the numerator and denominator by 5, you get 11/1 or $11.

Hope this helps