Keystones — Capstone
Five GCSE retrieval questions · 21 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 77°. Give your answer to 2 decimal places
Answer: 324.95cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 16:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 13, 48, 36, 34, 90, 94, 72. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 59, Range = 81