Keystones — Capstone
Five GCSE retrieval questions · 10 April 2022 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 75°
Answer: 162.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 82, 23, 42, 19, 82, 62, 33, 33
Answer: Mean = 52, Median = 42, Range = 73