Keystones — Capstone
Five GCSE retrieval questions · 6 July 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√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 = 26cm, b = 26cm, angle = 71°
Answer: 319.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:3. Find a:b:c.
Answer: 8:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 55, 98, 57, 40, 36, 34
Answer: Mean = 51.1, Median = 40, Range = 64