Keystones — Capstone
Five GCSE retrieval questions · 5 July 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 52°
Answer: 189.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 63, 11, 96, 64, 76, 63, 43
Answer: Mean = 61.1, Median = 64, Range = 85