Keystones — Capstone
Five GCSE retrieval questions · 27 May 2022 · 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 64°
Answer: 141.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 95, 46, 85, 28, 39, 38, 29
Answer: Mean = 57.1, Median = 46, Range = 69