Keystones — Capstone
Five GCSE retrieval questions · 11 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
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 = 20cm, b = 23cm, angle = 59°. Give your answer to 2 decimal places
Answer: 197.15cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 20:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 25, 89, 97, 91, 65, 76, 18, 44. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 70, Range = 79