Keystones — Capstone
Five GCSE retrieval questions · 11 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² - 3x + 12
Answer: (x - 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 352.89cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 20:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 48, 32, 74, 91, 17, 48. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 48, Range = 74