Solve these addition problems: 2+7+2, 215+5, 72+5, 55+3.

$$
2 + 7 + 2 = 11
$$
The sum is $\boxed{\text{11}}$.

$$
5 + 4 + 1 = 10
$$
Write down 0 and carry over 1 to the tens column.

$$
1 (\text{carry-over}) + 1 = 2
$$

$$
2
$$
The sum is $\boxed{\text{220}}$.

$$
2 + 5 = 7
$$

$$
7
$$
The sum is $\boxed{\text{77}}$.

$$
5 + 3 = 8
$$

$$
5
$$
The sum is $\boxed{\text{58}}$.