Keystones — Capstone
Five GCSE retrieval questions · 23 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 15
Answer: 5(x + 1)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 52°. Give your answer to 2 decimal places
Answer: 127.26cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 20:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 73, 42, 97, 72, 46, 74, 33, 64. Give your answer to 2 decimal places
Answer: Mean = 65.89, Median = 72, Range = 64