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So that you may skip the derivation process every time you have to calculate something
Just learn them.
-- Every time you buy an amount of something that's not a whole number, like 8.74 gallons of gas, or 11/2 pounds of sliced pastrami. -- Every time the price is not a whole number of dollars, like $1.49 or $29.32 .
You gotta know your time tables.. Then after you know them then you can learn division.
Every time you hand over money to pay for something. You expect the change, so if you hand over a £10 note and bought something for £6 then you subtract 6 from 10 and expect to get £4 in change.