Keystones — Capstone
Five GCSE retrieval questions · 30 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 2
Answer: 4(x + 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 42°. Give your answer to 2 decimal places
Answer: 74.94cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:15:27 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 27, 68, 53, 31, 44, 71, 98, 51. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 51, Range = 71