Keystones — Capstone
Five GCSE retrieval questions · 5 December 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 68°
Answer: 242cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 29, 18, 62, 60, 44, 50, 38, 81
Answer: Mean = 44.9, Median = 44, Range = 63