Keystones — Capstone
Five GCSE retrieval questions · 13 August 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 69°
Answer: 364.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 39, 96, 94, 80, 21, 84
Answer: Mean = 65.9, Median = 80, Range = 75