There was 35 balloons at the beginning of a party. By the end of the party, n of them had popped. Us

[math_celebrity]

There was 35 balloons at the beginning of a party. By the end of the party, n of them had popped. Using n, write an expression for the number of balloons that were left.

We start with 35, we take away or subtract n that popped. We're left with:
35 - n