Keystones — Capstone
Five GCSE retrieval questions · 9 February 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 + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 46°
Answer: 177.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 6:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 65, 82, 85, 100, 83, 36, 24
Answer: Mean = 70.6, Median = 83, Range = 76