Keystones — Capstone
Five GCSE retrieval questions · 29 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 6
Answer: 2(x + 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 80°. Give your answer to 2 decimal places
Answer: 226.01cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 63, 98, 31, 30, 82, 64. Give your answer to 2 decimal places
Answer: Mean = 64.43, Median = 64, Range = 68