Keystones — Capstone
Five GCSE retrieval questions · 23 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: x² - 5x + 7
Answer: (x - 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 45°. Give your answer to 2 decimal places
Answer: 161.22cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 36, 86, 95, 60, 61, 90
Answer: Mean = 73, Median = 83, Range = 59