Keystones — Capstone
Five GCSE retrieval questions · 24 February 2020 · 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 60°
Answer: 135.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 98, 96, 80, 60, 22, 34
Answer: Mean = 63, Median = 60, Range = 76