Keystones — Capstone
Five GCSE retrieval questions · 27 July 2021 · 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 54°
Answer: 99.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 68, 58, 83, 27, 31, 99
Answer: Mean = 56, Median = 58, Range = 73