Keystones — Capstone
Five GCSE retrieval questions · 25 March 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 65°
Answer: 232.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 2:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 84, 48, 94, 72, 47, 30
Answer: Mean = 63.9, Median = 72, Range = 64