Keystones — Capstone
Five GCSE retrieval questions · 15 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 8
Answer: 5(x - 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 54°. Give your answer to 2 decimal places
Answer: 110.43cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 30, 16, 86, 11, 10, 89. Give your answer to 2 decimal places
Answer: Mean = 41.43, Median = 30, Range = 79