Keystones — Capstone
Five GCSE retrieval questions · 8 February 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 63°
Answer: 162.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 4:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 54, 63, 73, 28, 89, 69, 42
Answer: Mean = 62.9, Median = 69, Range = 61