Keystones — Capstone
Five GCSE retrieval questions · 16 April 2019 · 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 64°
Answer: 143.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 6:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 83, 94, 56, 95, 62, 70
Answer: Mean = 76, Median = 72, Range = 39