Keystones — Capstone
Five GCSE retrieval questions · 11 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 68°. Give your answer to 2 decimal places
Answer: 163.18cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 15:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 52, 52, 10, 65, 64, 73. Give your answer to 2 decimal places
Answer: Mean = 49.29, Median = 52, Range = 63