Keystones — Capstone
Five GCSE retrieval questions · 9 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 3
Answer: 2(x + 4)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 25cm, angle = 71°. Give your answer to 2 decimal places
Answer: 200.92cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 24, 65, 51, 26, 79, 92, 82. Give your answer to 2 decimal places
Answer: Mean = 61.38, Median = 68.5, Range = 68