Keystones — Capstone
Five GCSE retrieval questions · 6 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√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 = 25cm, b = 19cm, angle = 65°
Answer: 215.2cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 83, 10, 48, 74, 67, 68, 67, 44
Answer: Mean = 57.7, Median = 67, Range = 73