Keystones — Capstone
Five GCSE retrieval questions · 11 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² + 7x + 3
Answer: (x + 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 62°. Give your answer to 2 decimal places
Answer: 109.04cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 14:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 74, 91, 23, 55, 47, 80, 61, 13. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 55, Range = 78