Keystones — Capstone
Five GCSE retrieval questions · 9 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 198.56cm² -
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: 30, 68, 55, 23, 100, 66, 48, 70, 67. Give your answer to 2 decimal places
Answer: Mean = 58.56, Median = 66, Range = 77