Keystones — Capstone
Five GCSE retrieval questions · 23 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 15
Answer: 3(x - 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 63°. Give your answer to 2 decimal places
Answer: 133.21cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 69, 71, 59, 95, 30, 40. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 59, Range = 65