Keystones — Capstone
Five GCSE retrieval questions · 6 May 2017 · 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 + 7x - 3
Answer: (x + 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 52°. Give your answer to 2 decimal places
Answer: 223.4cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 21:28:20 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 99, 17, 54, 41, 59, 19, 65, 78. Give your answer to 2 decimal places
Answer: Mean = 58.89, Median = 59, Range = 82