Keystones — Capstone
Five GCSE retrieval questions · 20 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 4
Answer: 3(x - 5)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 278.29cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:36:16 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 27, 73, 29, 88, 57, 55, 69
Answer: Mean = 54.75, Median = 56, Range = 61