Keystones — Capstone
Five GCSE retrieval questions · 10 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 3
Answer: 5(x - 5)² - 122 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 59°. Give your answer to 2 decimal places
Answer: 168cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 48, 83, 63, 61, 93, 15. Give your answer to 2 decimal places
Answer: Mean = 55.14, Median = 61, Range = 78