Keystones — Capstone
Five GCSE retrieval questions · 23 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 9
Answer: 2(x - 2)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 42°. Give your answer to 2 decimal places
Answer: 147.88cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 12:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 94, 17, 39, 92, 46, 16, 34. Give your answer to 2 decimal places
Answer: Mean = 51.63, Median = 42.5, Range = 78