Keystones — Capstone
Five GCSE retrieval questions · 30 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 97.92cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 21:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 59, 40, 69, 22, 38, 27, 98. Give your answer to 2 decimal places
Answer: Mean = 55.38, Median = 49.5, Range = 76