Keystones — Capstone
Five GCSE retrieval questions · 6 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 11
Answer: 5(x - 3)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 67°. Give your answer to 2 decimal places
Answer: 262.34cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 40, 59, 100, 19, 49, 97. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 49, Range = 81