Keystones — Capstone
Five GCSE retrieval questions · 9 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 8
Answer: 4(x - 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 54°. Give your answer to 2 decimal places
Answer: 169.89cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 24:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 82, 30, 28, 14, 16, 64. Give your answer to 2 decimal places
Answer: Mean = 40.86, Median = 30, Range = 68