Keystones — Capstone
Five GCSE retrieval questions · 7 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 9
Answer: (x - 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 176.94cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 84, 32, 56, 86, 79, 81. Give your answer to 2 decimal places
Answer: Mean = 69.86, Median = 79, Range = 54