Keystones — Capstone
Five GCSE retrieval questions · 1 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 7x - 5
Answer: (x + 7⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 58°. Give your answer to 2 decimal places
Answer: 130.6cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 74, 72, 63, 92, 34, 39, 32. Give your answer to 2 decimal places
Answer: Mean = 61.38, Median = 67.5, Range = 60