Keystones — Capstone
Five GCSE retrieval questions · 19 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² - 9x
Answer: (x - 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 66°. Give your answer to 2 decimal places
Answer: 274.06cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 86, 70, 17, 45, 83, 12, 78. Give your answer to 2 decimal places
Answer: Mean = 51.38, Median = 57.5, Range = 74