Keystones — Capstone
Five GCSE retrieval questions · 28 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 27cm, angle = 54°. Give your answer to 2 decimal places
Answer: 152.9cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 89, 64, 33, 89, 45, 37. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 62, Range = 56