Keystones — Capstone
Five GCSE retrieval questions · 24 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 12
Answer: (x + 11⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 61°. Give your answer to 2 decimal places
Answer: 291.69cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 23, 77, 61, 81, 69, 42, 47, 41. Give your answer to 2 decimal places
Answer: Mean = 50.67, Median = 47, Range = 66