1.9 · EstimationLesson 4 of 8
Estimating answers to calculations
Round every number to 1 significant figure, then work it out in your head. The estimate tells you if a calculator answer is sensible.
Locked
Unlock the rest of Cambridge O Level Mathematics: Number (4024).
- Every lesson, every resource, unlocked instantly.
- Track progress and pick up where you left off.
- Free preview lessons stay readable from the outline.