Keystones — Capstone
Five GCSE retrieval questions · 27 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 11
Answer: 2(x + 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 26cm, angle = 73°. Give your answer to 2 decimal places
Answer: 149.18cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 36:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 47, 40, 93, 94, 72, 45, 61. Give your answer to 2 decimal places
Answer: Mean = 59.38, Median = 54, Range = 71