Keystones — Capstone
Five GCSE retrieval questions · 10 May 2016 · 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 + 3x - 4
Answer: (x + 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 69°. Give your answer to 2 decimal places
Answer: 174.58cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 77, 52, 85, 59, 96, 38, 17, 58. Give your answer to 2 decimal places
Answer: Mean = 63.67, Median = 59, Range = 79