Keystones — Capstone
Five GCSE retrieval questions · 28 December 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 71°
Answer: 319.cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 66, 40, 84, 73, 86, 36, 74, 17
Answer: Mean = 54.1, Median = 66, Range = 75