Keystones — Capstone
Five GCSE retrieval questions · 20 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 74°
Answer: 109.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 99, 61, 65, 92, 56, 87, 96
Answer: Mean = 76.6, Median = 87, Range = 43