Percentages: The most useful statistics ever invented

This is when you put friendly numbers together first. For example, if you are adding something that saves .50 cents and another coupon that saves 1.25, add the .50 + .25 to get .75 first. Then add the dollar amounts. You can use many combinations of coins to total different amounts. You can get .50 with 5 dimes, or 2 quarters, or 2 dimes and 6 ... ................
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