Keystones — Capstone
Five GCSE retrieval questions · 7 November 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 71°
Answer: 147.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 88, 87, 59, 86, 52, 70, 73, 74
Answer: Mean = 73.1, Median = 73, Range = 36