Keystones — Capstone
Five GCSE retrieval questions · 24 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√54
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 6
Answer: 4(x - 5)² - 106 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 55°. Give your answer to 2 decimal places
Answer: 137.62cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 27:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 37, 61, 69, 31, 96, 74, 93, 98. Give your answer to 2 decimal places
Answer: Mean = 70.33, Median = 74, Range = 67