Keystones — Capstone
Five GCSE retrieval questions · 7 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 9x + 7
Answer: (x - 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 70°. Give your answer to 2 decimal places
Answer: 127.8cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 48:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 63, 67, 86, 50, 78, 69. Give your answer to 2 decimal places
Answer: Mean = 66.29, Median = 67, Range = 36