Keystones — Capstone
Five GCSE retrieval questions · 16 July 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 62°
Answer: 100.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:5. Find a:b:c.
Answer: 3:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 27, 68, 99, 76, 84, 33
Answer: Mean = 57.9, Median = 68, Range = 81