Keystones — Capstone
Five GCSE retrieval questions · 26 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 8
Answer: 5(x + 6)² - 172 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 74°. Give your answer to 2 decimal places
Answer: 269.15cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 18:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 93, 90, 16, 27, 60, 21, 48, 57. Give your answer to 2 decimal places
Answer: Mean = 49.22, Median = 48, Range = 77