Keystones — Capstone
Five GCSE retrieval questions · 5 November 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 68°
Answer: 277.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 78, 51, 15, 72, 18, 70, 56
Answer: Mean = 48, Median = 56, Range = 63