Keystones — Capstone
Five GCSE retrieval questions · 26 February 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 67°
Answer: 116cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 52, 43, 45, 21, 15, 42, 19, 96
Answer: Mean = 43.6, Median = 43, Range = 81