Keystones — Capstone
Five GCSE retrieval questions · 1 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 13
Answer: 2(x + 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 165.33cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 88, 93, 75, 79, 14, 84. Give your answer to 2 decimal places
Answer: Mean = 63.57, Median = 79, Range = 81