Keystones — Capstone
Five GCSE retrieval questions · 25 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 60°. Give your answer to 2 decimal places
Answer: 191.39cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 27:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 30, 73, 23, 78, 93, 100. Give your answer to 2 decimal places
Answer: Mean = 61.71, Median = 73, Range = 77