Keystones — Capstone
Five GCSE retrieval questions · 18 May 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 48°
Answer: 148.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 6:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 13, 15, 78, 15, 78, 36, 10
Answer: Mean = 40.1, Median = 36, Range = 68