Keystones — Capstone
Five GCSE retrieval questions · 8 April 2018 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 58°
Answer: 241.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:3. Find a:b:c.
Answer: 2:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 79, 36, 99, 13, 72, 24, 64, 52
Answer: Mean = 55.8, Median = 63, Range = 86