Keystones — Capstone
Five GCSE retrieval questions · 22 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 10
Answer: 3(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 195.84cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 25, 46, 92, 72, 81, 98, 88. Give your answer to 2 decimal places
Answer: Mean = 66.63, Median = 76.5, Range = 73