Keystones — Capstone
Five GCSE retrieval questions · 17 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 10
Answer: 3(x + 5)² - 85 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 78°. Give your answer to 2 decimal places
Answer: 205.41cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 67, 41, 51, 30, 19, 23. Give your answer to 2 decimal places
Answer: Mean = 39.29, Median = 41, Range = 48