Keystones — Capstone
Five GCSE retrieval questions · 1 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 13
Answer: 2(x - 6)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 222.15cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 27:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 70, 78, 18, 84, 34, 70, 95, 94. Give your answer to 2 decimal places
Answer: Mean = 68.44, Median = 73, Range = 77