Keystones — Capstone
Five GCSE retrieval questions · 16 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 13
Answer: 4(x - 3)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 52°. Give your answer to 2 decimal places
Answer: 124.11cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 81, 41, 73, 49, 69, 39, 42. Give your answer to 2 decimal places
Answer: Mean = 56.63, Median = 54, Range = 42