Keystones — Capstone
Five GCSE retrieval questions · 24 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 11x + 6
Answer: (x + 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 62°. Give your answer to 2 decimal places
Answer: 204.84cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 98, 79, 28, 23, 80, 59, 56. Give your answer to 2 decimal places
Answer: Mean = 56.63, Median = 57.5, Range = 75