1) Add the following decimals.
2) Add the following decimals.
3) Subtract the following decimals.
4) Subtract the following decimals.
5) Add the following decimals.
6) Add the following decimals.
7) Subtract the following decimals.
8) Subtract the following decimals.
9) You buy a movie for $19.99 and a set of earphones for $12.49. How much is the bill?