Keystones — Capstone
Five GCSE retrieval questions · 2 June 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 + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 56°
Answer: 174.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:3. Find a:b:c.
Answer: 3:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 70, 67, 66, 31, 19, 48, 50
Answer: Mean = 56.1, Median = 66, Range = 79