Keystones — Capstone
Five GCSE retrieval questions · 3 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 4
Answer: 4(x - 6)² - 148 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 78°. Give your answer to 2 decimal places
Answer: 216.17cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 68, 52, 31, 61, 99, 16, 98, 15. Give your answer to 2 decimal places
Answer: Mean = 50.67, Median = 52, Range = 84