Keystones — Capstone
Five GCSE retrieval questions · 14 December 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 + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 22cm, angle = 47°
Answer: 112.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 57, 66, 31, 20, 25, 21
Answer: Mean = 33.6, Median = 25, Range = 51