Keystones — Capstone
Five GCSE retrieval questions · 16 September 2012 · 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 + 5x + 8
Answer: (x + 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 77°. Give your answer to 2 decimal places
Answer: 187.08cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 15:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 52, 92, 39, 56, 48, 70, 18. Give your answer to 2 decimal places
Answer: Mean = 55.88, Median = 54, Range = 74