Keystones — Capstone
Five GCSE retrieval questions · 16 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 7
Answer: 2(x + 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 168.29cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 33, 52, 12, 58, 77, 50. Give your answer to 2 decimal places
Answer: Mean = 46.43, Median = 50, Range = 65