Keystones — Capstone
Five GCSE retrieval questions · 7 September 2019 · 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 59°
Answer: 94.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 30, 16, 73, 29, 35, 72
Answer: Mean = 42.4, Median = 35, Range = 57