Practice Addition and Subtraction Multiple

Difficulty: practice

Getting started with multiple and nested addition and subtraction of both positive and negative numbers. Remember to calculate the inner brackets first and that subtracting a negative is the same as adding.
Question: What is 1 + (0 - (1 + 1))?
So we do the innermost brackets first 1 + (0 - 2)
This becomes 1 + -2
Answer is -1