Keystones — Capstone
Five GCSE retrieval questions · 22 April 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 69°
Answer: 274.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 19, 69, 39, 90, 94, 35, 96, 93
Answer: Mean = 63.7, Median = 69, Range = 77