Keystones — Capstone
Five GCSE retrieval questions · 18 July 2014 · 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 - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 73°. Give your answer to 2 decimal places
Answer: 167.35cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 12:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 10, 99, 60, 98, 81, 71, 43. Give your answer to 2 decimal places
Answer: Mean = 64.88, Median = 65.5, Range = 89