Keystones — Capstone
Five GCSE retrieval questions · 25 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² - 9x - 2
Answer: (x - 9⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 70°. Give your answer to 2 decimal places
Answer: 367.89cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 51, 82, 37, 77, 59, 83. Give your answer to 2 decimal places
Answer: Mean = 57.86, Median = 59, Range = 67