Keystones — Capstone
Five GCSE retrieval questions · 28 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 12
Answer: (x - 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 61°. Give your answer to 2 decimal places
Answer: 137.75cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 11, 67, 24, 20, 97, 44, 40
Answer: Mean = 49, Median = 42, Range = 86