Keystones — Capstone
Five GCSE retrieval questions · 28 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 9
Answer: 2(x + 4)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 60°. Give your answer to 2 decimal places
Answer: 124.71cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 72:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 16, 49, 21, 39, 59, 33, 74, 31. Give your answer to 2 decimal places
Answer: Mean = 42.33, Median = 39, Range = 58