Keystones — Capstone
Five GCSE retrieval questions · 19 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 14
Answer: 4(x - 6)² - 158 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 62°. Give your answer to 2 decimal places
Answer: 143.04cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 23, 98, 55, 79, 31, 89
Answer: Mean = 57, Median = 55, Range = 75