Keystones — Capstone
Five GCSE retrieval questions · 12 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 15cm, angle = 43°
Answer: 66.5cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 97, 61, 61, 53, 13, 59, 89
Answer: Mean = 61.6, Median = 61, Range = 84