Keystones — Capstone
Five GCSE retrieval questions · 27 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 9
Answer: (x - 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 52°. Give your answer to 2 decimal places
Answer: 97.32cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 20, 88, 68, 72, 69, 64. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 68, Range = 73