Keystones — Capstone
Five GCSE retrieval questions · 5 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 29cm, angle = 77°
Answer: 310.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 91, 24, 71, 34, 90, 42, 70, 81
Answer: Mean = 60, Median = 70, Range = 67