Keystones — Capstone
Five GCSE retrieval questions · 19 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² + 3x + 9
Answer: (x + 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 76°. Give your answer to 2 decimal places
Answer: 176.59cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 8:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 95, 94, 66, 30, 36, 60, 38
Answer: Mean = 64.25, Median = 63, Range = 65