Keystones — Capstone
Five GCSE retrieval questions · 23 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 5
Answer: 5(x + 5)² - 120 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 108.76cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 30, 75, 37, 79, 62, 61, 30, 66. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 62, Range = 49