Keystones — Capstone
Five GCSE retrieval questions · 11 June 2021 · 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 55°
Answer: 206.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 34, 46, 38, 72, 36, 40, 58, 63
Answer: Mean = 51.1, Median = 46, Range = 39