Keystones — Capstone
Five GCSE retrieval questions · 5 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 4
Answer: (x + 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 46°. Give your answer to 2 decimal places
Answer: 103.94cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 97, 86, 67, 24, 40, 86, 100, 38. Give your answer to 2 decimal places
Answer: Mean = 66.89, Median = 67, Range = 76