Keystones — Capstone
Five GCSE retrieval questions · 1 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 57°. Give your answer to 2 decimal places
Answer: 215.12cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:35:56 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 87, 66, 31, 70, 61, 84. Give your answer to 2 decimal places
Answer: Mean = 60.71, Median = 66, Range = 61