Keystones — Capstone
Five GCSE retrieval questions · 22 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√250
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 257.74cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 18:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 37, 69, 17, 71, 46, 19. Give your answer to 2 decimal places
Answer: Mean = 48.29, Median = 46, Range = 62