Keystones — Capstone
Five GCSE retrieval questions · 8 February 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 - x + 2
Answer: (x - 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 43°. Give your answer to 2 decimal places
Answer: 106.39cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 21:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 66, 57, 84, 72, 39, 34. Give your answer to 2 decimal places
Answer: Mean = 59.29, Median = 63, Range = 50