Keystones — Capstone
Five GCSE retrieval questions · 30 August 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 52°
Answer: 127.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 12:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 83, 18, 66, 49, 62, 50, 47, 89
Answer: Mean = 55.6, Median = 50, Range = 71