Keystones — Capstone
Five GCSE retrieval questions · 21 March 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√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 = 19cm, b = 23cm, angle = 44°
Answer: 151.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 81, 36, 91, 55, 47, 100, 64
Answer: Mean = 71.5, Median = 81, Range = 64