Keystones — Capstone
Five GCSE retrieval questions · 21 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 14
Answer: 5(x + 6)² - 166 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 69.94cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 94, 32, 22, 65, 99, 19, 28, 98. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 61, Range = 80