Keystones — Capstone
Five GCSE retrieval questions · 8 March 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 74°
Answer: 161.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 80, 71, 10, 29, 20, 58, 95, 81
Answer: Mean = 58.7, Median = 71, Range = 85