Keystones — Capstone
Five GCSE retrieval questions · 25 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 9x
Answer: (x - 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 50°. Give your answer to 2 decimal places
Answer: 152.83cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 75, 40, 68, 47, 72, 36, 27. Give your answer to 2 decimal places
Answer: Mean = 54.88, Median = 57.5, Range = 48