Keystones — Capstone
Five GCSE retrieval questions · 26 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 3
Answer: 2(x - 5)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 61°. Give your answer to 2 decimal places
Answer: 110.2cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 45:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 64, 47, 24, 91, 34, 73. Give your answer to 2 decimal places
Answer: Mean = 59.29, Median = 64, Range = 67