Keystones — Capstone
Five GCSE retrieval questions · 8 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 2
Answer: 5(x - 5)² - 127 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 76°. Give your answer to 2 decimal places
Answer: 116.44cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 63:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 53, 86, 12, 25, 48, 64, 94. Give your answer to 2 decimal places
Answer: Mean = 52.88, Median = 50.5, Range = 82