Keystones — Capstone
Five GCSE retrieval questions · 19 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 10
Answer: 3(x + 6)² - 118 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 60°. Give your answer to 2 decimal places
Answer: 236.42cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 8:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 57, 55, 89, 71, 30, 60. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 57, Range = 59