Keystones — Capstone
Five GCSE retrieval questions · 21 April 2021 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 77°
Answer: 171cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 87, 54, 99, 36, 23, 78
Answer: Mean = 56.6, Median = 54, Range = 80