Keystones — Capstone
Five GCSE retrieval questions · 2 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 71°. Give your answer to 2 decimal places
Answer: 208.49cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 87, 84, 97, 26, 46, 10. Give your answer to 2 decimal places
Answer: Mean = 59.14, Median = 64, Range = 87