Keystones — Capstone
Five GCSE retrieval questions · 28 June 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 + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 16cm, angle = 48°
Answer: 154.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 33, 28, 61, 31, 65, 56, 60, 92
Answer: Mean = 53.6, Median = 56, Range = 64