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It's called "milling", and it's a historical relic.
At one time, coins were made of precious metals (gold or silver). Unscrupulous people would shave the edges of coins and collect the shavings to melt down. Milling the edges makes it obvious that this has been done, and that the coin therefore wasn't worth full value.
Neither quarters nor dimes still contain any gold or silver, but they're still milled, mostly because they've been that way for a long time, and ceasing to mill them would make them look "weird" to people at this point.
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If there twice as many dimes then quarters in 2.25 how many dimes are there?
10 dimes 5 quarters
How many quarters in 325 dimes?
130 quarters are in 325 dimes
How many dimes are in 19.75 if the amount contains only dimes and quarters?
There are 39 combinations of dimes and quarters that will total 19.75 from 1 quarter and 195 dimes to 77 quarters and 5 dimes.
How many ways can you make ten dollars with quarters and dimes?
I believe there are 19 ways to make ten dollars with only quarters and dimes. Quarters have to be in increments of 2 so there would be 2 quarters and 95 dimes, 4 quarters and 90 dimes and so on til there are 38 quarters and 5 dimes.
Why are nickels and pennies smooth around the edges and quarters and dimes aren't?
The ridges on the edges of coins are called "reeds". Many years ago when quarters, dimes, and half dollars had silver in them, people would shave the edges, sell the silver, and still use the shaved coin for the face value of the coin. The mint added reeds so it could easily be determined if the coin was shaved or not.
