Keystones — Capstone
Five GCSE retrieval questions · 10 August 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 63°
Answer: 336.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 80, 59, 94, 84, 19, 77, 68
Answer: Mean = 68.5, Median = 77, Range = 75