Keystones — Capstone
Five GCSE retrieval questions · 20 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 4
Answer: 5(x + 5)² - 121 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 54°. Give your answer to 2 decimal places
Answer: 206.3cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 66, 60, 69, 79, 35, 42. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 60, Range = 57