Keystones — Capstone
Five GCSE retrieval questions · 30 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 + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 45°. Give your answer to 2 decimal places
Answer: 74.25cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 63:28:24 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 41, 71, 37, 26, 60, 74, 12
Answer: Mean = 44.25, Median = 39, Range = 62