Keystones — Capstone
Five GCSE retrieval questions · 8 January 2023 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 70°
Answer: 299.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 77, 61, 73, 57, 66, 45
Answer: Mean = 64.6, Median = 66, Range = 32