Keystones — Capstone
Five GCSE retrieval questions · 2 February 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 42°
Answer: 154.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 66, 50, 41, 39, 38, 58
Answer: Mean = 47.3, Median = 41, Range = 28