Keystones — Capstone
Five GCSE retrieval questions · 18 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 9
Answer: 4(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 160.29cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 56:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 45, 65, 54, 66, 48, 73, 11
Answer: Mean = 57.5, Median = 59.5, Range = 87