Keystones — Capstone
Five GCSE retrieval questions · 10 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 8
Answer: 3(x + 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 40°. Give your answer to 2 decimal places
Answer: 128.24cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 48:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 85, 48, 95, 36, 18, 57, 96. Give your answer to 2 decimal places
Answer: Mean = 55.63, Median = 52.5, Range = 86