When adding or subtracting fractions with different denominators then their LCD must be found in order to carry out the calculations.
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It means Lowest Common Denominator.
everyday they use math
the banks use math so they can get their pay and count money
We use 99.9 percent of math in our everyday life.
Artists will use math when they are drawing something if they need to know the dimensions to draw. They might also use math when they are determining pricing.