10 x 10c coins
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10 dimes make one dollar.
There are 10 ten-cent coins in one dollar. This is because each ten-cent coin represents 0.10 of a dollar, and 10 of these coins would equal 1 dollar. Therefore, you would need 10 ten-cent coins to make 1 dollar.
10 nickels and 2 quarters
You can make a dollar with any sorts of combinations of coins. A dollar is 100 cents. So 4 quarters or 2 $.50 pieces or 10 dimes or 4 nickels +8 dimes.
50, 25, 10, 10, 10, 10, 1, 1, 1, 1. This is the largest total that can't make change for *any* amount.