Keystones — Capstone
Five GCSE retrieval questions · 12 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 80°. Give your answer to 2 decimal places
Answer: 140.34cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 84, 70, 33, 16, 35, 36, 62
Answer: Mean = 47.25, Median = 39, Range = 68