Keystones — Capstone
Five GCSE retrieval questions · 1 July 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 56°
Answer: 133.5cm² -
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: 90, 22, 12, 55, 74, 79, 90
Answer: Mean = 60.3, Median = 74, Range = 78