Keystones — Capstone
Five GCSE retrieval questions · 24 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 194.14cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 57, 22, 81, 65, 77, 28, 24, 72. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 57, Range = 59