Keystones — Capstone
Five GCSE retrieval questions · 20 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 9
Answer: 2(x - 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 78°. Give your answer to 2 decimal places
Answer: 203.45cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 64, 55, 76, 35, 83, 93. Give your answer to 2 decimal places
Answer: Mean = 65.14, Median = 64, Range = 58