Keystones — Capstone
Five GCSE retrieval questions · 13 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√28
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 12
Answer: 5(x - 3)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 30cm, angle = 65°. Give your answer to 2 decimal places
Answer: 285.49cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 31, 76, 29, 65, 86, 51, 53. Give your answer to 2 decimal places
Answer: Mean = 50.63, Median = 52, Range = 72