Keystones — Capstone
Five GCSE retrieval questions · 17 November 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 + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 75°
Answer: 98.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 19, 35, 41, 63, 59, 10
Answer: Mean = 42.4, Median = 41, Range = 60