Keystones — Capstone
Five GCSE retrieval questions · 19 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√175
Answer: 25√7 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 12
Answer: 3(x + 6)² - 120 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 187.78cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 55, 59, 22, 41, 69, 65, 93, 36. Give your answer to 2 decimal places
Answer: Mean = 54.89, Median = 55, Range = 71