Keystones — Capstone
Five GCSE retrieval questions · 19 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 46°. Give your answer to 2 decimal places
Answer: 107.54cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 40, 89, 66, 85, 58, 16. Give your answer to 2 decimal places
Answer: Mean = 59.29, Median = 61, Range = 73