Keystones — Capstone
Five GCSE retrieval questions · 9 May 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
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 = 22cm, b = 30cm, angle = 71°
Answer: 312cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 17, 69, 73, 32, 25, 45, 60, 38
Answer: Mean = 43.2, Median = 38, Range = 56