Keystones — Capstone
Five GCSE retrieval questions · 6 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 6
Answer: 5(x - 5)² - 131 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 30cm, angle = 74°. Give your answer to 2 decimal places
Answer: 432.57cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 37, 60, 100, 71, 65, 25, 99, 27
Answer: Mean = 56, Median = 60, Range = 80