Keystones — Capstone
Five GCSE retrieval questions · 21 June 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 16cm, b = 18cm, angle = 60°
Answer: 124.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 34, 17, 23, 22, 79, 93, 38
Answer: Mean = 45.1, Median = 38, Range = 76