Keystones — Capstone
Five GCSE retrieval questions · 28 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 7x - 4
Answer: (x + 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 40°. Give your answer to 2 decimal places
Answer: 116.99cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 28:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 26, 56, 41, 63, 35, 97, 49, 31. Give your answer to 2 decimal places
Answer: Mean = 46.56, Median = 41, Range = 76