Keystones — Capstone
Five GCSE retrieval questions · 1 November 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 61°
Answer: 144.3cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 98, 83, 90, 60, 78, 31
Answer: Mean = 69.4, Median = 78, Range = 67