Adding and subtracting together
Sometimes a sum has both + and − signs. When only these two signs are used, just work from left to right, one step at a time.
Key idea
With only + and −, solve from left to right. Do the first two numbers, then use that answer with the next number.
Worked example
Worked example
Work out 100 + 50 − 30.
Step 1: 100 + 50 = 150
Step 2: 150 − 30 = 120
So 100 + 50 − 30 = 120.
Careful with order
Do not jump to the last number first. Always go left to right so you do not make a mistake.
Remember
- Work from left to right.
- One step at a time.
- Use each answer for the next step.