Keystones — Capstone
Five GCSE retrieval questions · 18 February 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 75°
Answer: 144.4cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:4. Find a:b:c.
Answer: 12:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 64, 55, 55, 31, 61, 81, 19
Answer: Mean = 57.3, Median = 61, Range = 73