Keystones — Capstone
Five GCSE retrieval questions · 26 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 11
Answer: 3(x + 5)² - 64 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 50°. Give your answer to 2 decimal places
Answer: 176.19cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 37, 67, 89, 47, 98, 93, 100, 87. Give your answer to 2 decimal places
Answer: Mean = 71.22, Median = 87, Range = 77