Keystones — Capstone
Five GCSE retrieval questions · 7 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 13
Answer: 3(x - 3)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 152.31cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 63:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 43, 95, 98, 39, 88, 21
Answer: Mean = 64, Median = 64, Range = 77