Keystones — Capstone
Five GCSE retrieval questions · 16 August 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
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 = 15cm, b = 12cm, angle = 53°
Answer: 71.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 72, 61, 84, 97, 94, 74, 89, 81
Answer: Mean = 74.6, Median = 81, Range = 78