Keystones — Capstone
Five GCSE retrieval questions · 31 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 6
Answer: 3(x + 4)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 74°. Give your answer to 2 decimal places
Answer: 282.61cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 30, 74, 18, 54, 84, 17. Give your answer to 2 decimal places
Answer: Mean = 50.71, Median = 54, Range = 67