Keystones — Capstone
Five GCSE retrieval questions · 26 March 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 = 12cm, b = 17cm, angle = 69°
Answer: 95.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 4:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 76, 47, 11, 19, 21, 12
Answer: Mean = 39.6, Median = 21, Range = 80