Keystones — Capstone
Five GCSE retrieval questions · 23 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 46°. Give your answer to 2 decimal places
Answer: 107.54cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 21:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 71, 83, 86, 19, 31, 33. Give your answer to 2 decimal places
Answer: Mean = 50.71, Median = 33, Range = 67