Keystones — Capstone
Five GCSE retrieval questions · 23 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 14
Answer: 3(x - 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 45°. Give your answer to 2 decimal places
Answer: 123.04cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 17, 24, 28, 39, 30, 21, 34, 37. Give your answer to 2 decimal places
Answer: Mean = 35.89, Median = 30, Range = 76