Keystones — Capstone
Five GCSE retrieval questions · 15 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 2
Answer: 3(x - 5)² - 77 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 70°. Give your answer to 2 decimal places
Answer: 183.71cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 27:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 14, 64, 37, 76, 60, 22, 35. Give your answer to 2 decimal places
Answer: Mean = 42.38, Median = 36, Range = 62