To determine the aperture of the rocket nozzle that will take us to the next set of planets out among the stars.
Oh, and to make change correctly at the local farmers market for some really good tomatoes at 75 ¢ each.
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Math
everyday they use math
That really depends in what you want to work in the future. If you want to study some engineering field, you'll need LOTS of math. If you want to teach in schools or colleges, you may well require SOME math. For many other areas, you'll need only very basic math knowledge.
the banks use math so they can get their pay and count money
We use 99.9 percent of math in our everyday life.