Keystones — Capstone
Five GCSE retrieval questions · 10 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√40
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 7
Answer: (x + 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 56°. Give your answer to 2 decimal places
Answer: 264.46cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 81, 81, 74, 73, 70, 98, 18, 45. Give your answer to 2 decimal places
Answer: Mean = 69.67, Median = 74, Range = 80