Keystones — Capstone
Five GCSE retrieval questions · 31 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 80°. Give your answer to 2 decimal places
Answer: 100.45cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 100, 44, 65, 67, 42, 83, 47. Give your answer to 2 decimal places
Answer: Mean = 59.38, Median = 56, Range = 73