Keystones — Capstone
Five GCSE retrieval questions · 19 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 61°. Give your answer to 2 decimal places
Answer: 224.34cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 20:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 45, 21, 13, 28, 28, 99. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 28, Range = 86