Keystones — Capstone
Five GCSE retrieval questions · 15 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 62°. Give your answer to 2 decimal places
Answer: 117.43cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 15:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 80, 31, 34, 44, 50, 90, 76, 93. Give your answer to 2 decimal places
Answer: Mean = 63.22, Median = 71, Range = 62