Keystones — Capstone
Five GCSE retrieval questions · 6 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 2
Answer: 4(x - 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 54°. Give your answer to 2 decimal places
Answer: 111.64cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 15:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 82, 64, 38, 38, 50, 63. Give your answer to 2 decimal places
Answer: Mean = 54.14, Median = 50, Range = 44