Keystones — Capstone
Five GCSE retrieval questions · 17 April 2012 · 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: 2x² + 4x - 8
Answer: 2(x + 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 46°. Give your answer to 2 decimal places
Answer: 90.64cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 30, 64, 91, 94, 36, 72, 60. Give your answer to 2 decimal places
Answer: Mean = 64.38, Median = 66, Range = 64