Keystones — Capstone
Five GCSE retrieval questions · 21 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√176
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 9
Answer: (x - 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 243.02cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 19, 72, 39, 13, 47, 38, 86, 27. Give your answer to 2 decimal places
Answer: Mean = 43.22, Median = 39, Range = 73