Keystones — Capstone
Five GCSE retrieval questions · 3 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
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 = 20cm, b = 13cm, angle = 47°. Give your answer to 2 decimal places
Answer: 95.08cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 71, 22, 72, 85, 49, 64, 36. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 61, Range = 63