Keystones — Capstone
Five GCSE retrieval questions · 20 October 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
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 = 20cm, b = 27cm, angle = 77°
Answer: 263.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 4:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 35, 58, 64, 73, 71, 74, 26, 73
Answer: Mean = 57.8, Median = 64, Range = 48