Keystones — Capstone
Five GCSE retrieval questions · 7 December 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√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 = 27cm, b = 29cm, angle = 63°
Answer: 348.8cm² -
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: 84, 81, 24, 83, 25, 34, 38
Answer: Mean = 52.7, Median = 38, Range = 60