Keystones — Capstone
Five GCSE retrieval questions · 14 July 2021 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 60°
Answer: 62.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:3. Find a:b:c.
Answer: 16:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 41, 31, 10, 12, 46, 27, 20
Answer: Mean = 29.6, Median = 31, Range = 40