Keystones — Capstone
Five GCSE retrieval questions · 2 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 47°. Give your answer to 2 decimal places
Answer: 137.86cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 23, 75, 39, 99, 72, 38. Give your answer to 2 decimal places
Answer: Mean = 55.14, Median = 40, Range = 76