Keystones — Capstone
Five GCSE retrieval questions · 5 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 4
Answer: 5(x - 6)² - 176 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 257.74cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 71, 95, 54, 21, 71, 11. Give your answer to 2 decimal places
Answer: Mean = 54.14, Median = 56, Range = 84