Keystones — Capstone
Five GCSE retrieval questions · 6 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 11
Answer: 3(x - 1)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 46°. Give your answer to 2 decimal places
Answer: 65.46cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 94, 84, 35, 18, 51, 44. Give your answer to 2 decimal places
Answer: Mean = 48.57, Median = 44, Range = 80