Keystones — Capstone
Five GCSE retrieval questions · 26 July 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 74°
Answer: 106.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 4:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 75, 29, 84, 41, 56, 42
Answer: Mean = 52.7, Median = 42, Range = 55