Keystones — Capstone
Five GCSE retrieval questions · 9 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 10
Answer: 4(x + 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 60°. Give your answer to 2 decimal places
Answer: 228.63cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 11, 21, 44, 75, 61, 53, 59, 40. Give your answer to 2 decimal places
Answer: Mean = 45.22, Median = 44, Range = 64