Keystones — Capstone
Five GCSE retrieval questions · 4 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 65°
Answer: 244.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 69, 71, 56, 27, 51, 69, 67, 34
Answer: Mean = 53.1, Median = 56, Range = 44