Keystones — Capstone
Five GCSE retrieval questions · 24 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√150
Answer: 25√6 -
2. Algebra Completing the square
Complete the square: x² + 9x + 5
Answer: (x + 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 69°. Give your answer to 2 decimal places
Answer: 78.42cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 12:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 85, 26, 40, 85, 58, 40. Give your answer to 2 decimal places
Answer: Mean = 55.71, Median = 56, Range = 59