Keystones — Capstone
Five GCSE retrieval questions · 4 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 50°
Answer: 160.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 27, 37, 54, 80, 98, 24, 97, 83
Answer: Mean = 60.8, Median = 54, Range = 74