Keystones — Capstone
Five GCSE retrieval questions · 15 July 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 45°
Answer: 257.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 14, 93, 34, 23, 38, 32
Answer: Mean = 37.3, Median = 32, Range = 79