Keystones — Capstone
Five GCSE retrieval questions · 28 October 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 72°
Answer: 259.6cm² -
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: 58, 74, 20, 61, 71, 78, 14, 99, 16
Answer: Mean = 54.6, Median = 61, Range = 85