Keystones — Capstone
Five GCSE retrieval questions · 13 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 100.91cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 39, 98, 70, 95, 18, 30, 19, 68. Give your answer to 2 decimal places
Answer: Mean = 58.89, Median = 68, Range = 80