Keystones — Capstone
Five GCSE retrieval questions · 1 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√18
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 7
Answer: 2(x - 1)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 43°. Give your answer to 2 decimal places
Answer: 75.36cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 20, 18, 91, 58, 30, 76, 99, 55. Give your answer to 2 decimal places
Answer: Mean = 51.67, Median = 55, Range = 81