Keystones — Capstone
Five GCSE retrieval questions · 10 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 80°. Give your answer to 2 decimal places
Answer: 165.45cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 15:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 57, 99, 49, 74, 71, 34. Give your answer to 2 decimal places
Answer: Mean = 61.86, Median = 57, Range = 65