Keystones — Capstone
Five GCSE retrieval questions · 2 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 1
Answer: (x + 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 57°. Give your answer to 2 decimal places
Answer: 158.09cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 48:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 84, 79, 17, 93, 58, 95, 77
Answer: Mean = 74, Median = 81.5, Range = 78