Keystones — Capstone
Five GCSE retrieval questions · 20 December 2019 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 72°
Answer: 210.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:4. Find a:b:c.
Answer: 6:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 92, 50, 95, 82, 76, 90, 29, 86
Answer: Mean = 75.8, Median = 82, Range = 66