Keystones — Capstone
Five GCSE retrieval questions · 12 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 7
Answer: 2(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 50°. Give your answer to 2 decimal places
Answer: 123.33cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 2:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 71, 47, 51, 53, 82, 55, 51, 27. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 53, Range = 55