Keystones — Capstone
Five GCSE retrieval questions · 17 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 89.45cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 77, 51, 68, 74, 77, 51, 38, 82. Give your answer to 2 decimal places
Answer: Mean = 62.11, Median = 68, Range = 44