Keystones — Capstone
Five GCSE retrieval questions · 24 May 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 80°
Answer: 234.4cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 63, 66, 69, 92, 43, 72, 56, 43
Answer: Mean = 62.1, Median = 63, Range = 49