Keystones — Capstone
Five GCSE retrieval questions · 13 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 8
Answer: 3(x - 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 78°. Give your answer to 2 decimal places
Answer: 268.99cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 57, 94, 38, 74, 69, 74. Give your answer to 2 decimal places
Answer: Mean = 65.29, Median = 69, Range = 56