Keystones — Capstone
Five GCSE retrieval questions · 30 March 2013 · 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 - 9x + 1
Answer: (x - 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 17cm, angle = 51°. Give your answer to 2 decimal places
Answer: 158.54cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:40:72 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 55, 46, 40, 95, 13, 57, 62, 62
Answer: Mean = 54, Median = 56, Range = 82