Keystones — Capstone
Five GCSE retrieval questions · 5 December 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 47°
Answer: 76.8cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 34, 98, 92, 67, 63, 22, 41
Answer: Mean = 60.9, Median = 67, Range = 76