Almost everyone has a calculator in their pockets these days, but it's easy to calculate the tip after the next meal without pulling it out.

Simple math tricks that make life easier are the best math tricks, and in terms of frequency of use, this trick is at the top of our list. Adding a tip to the cost of a meal is a common practice in American culture, and most of us will do it thousands of times in our lives. Instead of inspiring a guess or getting a calculator, you can use the following trick instead. For example, we use a food price of $ 44.37.

- Take the food cost and round it to the nearest whole number. Our example menu is rounded to the nearest integer: $ 45.00.
- Calculate 1
- If you want to tip 15%, you'll need to take half of the amount you just got and add it: half of $ 4.50 is $ 2.25 , Together, this adds a tip of $ 6.75. If you want to tip 20%, double this – $ 4.50 * 2 is $ 9. Good service? Triple it for a 30% tip – $ 4.50 * 3 is $ 13.50.

Of course, you can always turn off your calculator and use a simple multiplier if you prefer super-precision and cold, hard calculations versus clever mathematical parlor tricks to calculate the tip. For those of you who are a bit rusty in elementary school, the equation for calculating a percentage is the original value * 0.X, where X is the percentage. If we calculated the exact tip of 20% for our hypothetical food, it would be $ 44.37 * $ 0.20 = $ 8.95.

It looks like our little salon trick worked quite well. We spent a bit more money on tips but did not have to mess around with our phone and got a bit of mental stimulation from the experience.