Keystones — Capstone
Five GCSE retrieval questions · 23 January 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 40°
Answer: 104.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 84, 42, 40, 64, 21, 28, 36, 43
Answer: Mean = 45.9, Median = 42, Range = 63