First, we add zeros to the decimals so they all have the same number
of decimal places. We at Shmoop don't always preach conformity, but in
this case it's a must:

0.500 + 0.940 + 0.032

Now, we line them up at the decimal point and add:

0.500 0.940 + 0.032 = 1.472

Example 2

Solve 0.223 - 0.101.

These decimals already have the same number of decimal places. Bless
their hearts. We just line them up at the decimal point and subtract:

0.223 - 0.101 = 0.122

Example 3

Solve 0.1803 - 0.09.

First, add zeros on the end of 0.09 to make it 0.0900. Then, line up the decimals and subtract: