Keystones — Capstone
Five GCSE retrieval questions · 26 September 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 30cm, angle = 61°
Answer: 170.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 18, 23, 71, 36, 75, 41, 69, 95
Answer: Mean = 52.8, Median = 47, Range = 77