Keystones — Capstone
Five GCSE retrieval questions · 10 April 2018 · 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 61°
Answer: 354.2cm² -
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: 70, 35, 96, 45, 26, 71, 92, 54, 62
Answer: Mean = 61.2, Median = 62, Range = 70