Keystones — Capstone
Five GCSE retrieval questions · 7 September 2018 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 65°
Answer: 152.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 20, 16, 34, 33, 96, 74, 86, 38
Answer: Mean = 47.8, Median = 34, Range = 80