Watch first
A worked question
About a minute each. The question, time to think, then how to do it and the mistake to avoid.
Mean: working with totals
Finding a missing value from how the mean changes.
Data practice
No timerCore questions. No timer: check each answer as you go, then read the explanation.
1. A bar chart's scale goes up in steps of 40. A bar ends a quarter of the way from 80 to 120. What does the bar show?
These 10 are free
Every topic gives you 10 questions to try, at any level, with the full explanation on each one. A subscription opens the rest — and in the maths topics the questions are generated, so they never run out and never repeat.