Keystones — Capstone
Five GCSE retrieval questions · 3 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 12
Answer: 2(x - 4)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 50°. Give your answer to 2 decimal places
Answer: 195.34cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 84, 15, 94, 48, 57, 86, 41
Answer: Mean = 57, Median = 52.5, Range = 79