Keystones — Capstone
Five GCSE retrieval questions · 7 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 5
Answer: 4(x + 2)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 55°. Give your answer to 2 decimal places
Answer: 154.82cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 64, 57, 94, 44, 65, 39. Give your answer to 2 decimal places
Answer: Mean = 57.57, Median = 57, Range = 55