Keystones — Capstone
Five GCSE retrieval questions · 23 September 2018 · 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 + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 41°
Answer: 64cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 93, 20, 66, 34, 41, 50, 59
Answer: Mean = 48.6, Median = 50, Range = 73