Keystones — Capstone
Five GCSE retrieval questions · 28 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 10
Answer: (x + 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 68°. Give your answer to 2 decimal places
Answer: 220.67cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 54, 22, 88, 21, 28, 34. Give your answer to 2 decimal places
Answer: Mean = 41.43, Median = 34, Range = 67