Keystones — Capstone
Five GCSE retrieval questions · 24 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² - x - 6
Answer: (x - 1⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 56°. Give your answer to 2 decimal places
Answer: 99.48cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 99, 53, 33, 67, 65, 44, 84. Give your answer to 2 decimal places
Answer: Mean = 64.38, Median = 66, Range = 66