Keystones — Capstone
Five GCSE retrieval questions · 26 July 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 21cm, angle = 51°
Answer: 228.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:3. Find a:b:c.
Answer: 8:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 86, 89, 47, 64, 45, 66, 28, 69
Answer: Mean = 62.2, Median = 66, Range = 61