Keystones — Capstone
Five GCSE retrieval questions · 15 August 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 72°
Answer: 173.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 30, 73, 47, 40, 21, 68, 43, 60
Answer: Mean = 47.4, Median = 45, Range = 52