Keystones — Capstone
Five GCSE retrieval questions · 30 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 11x + 5
Answer: (x + 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 63°. Give your answer to 2 decimal places
Answer: 220.08cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 43, 59, 70, 50, 62, 46, 50. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 54.5, Range = 48