Keystones — Capstone
Five GCSE retrieval questions · 24 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√112
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 11
Answer: (x + 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 51°. Give your answer to 2 decimal places
Answer: 272cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 28:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 54, 70, 51, 90, 40, 47, 40, 23. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 51, Range = 67