Keystones — Capstone
Five GCSE retrieval questions · 11 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² + 9x - 12
Answer: (x + 9⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 63°. Give your answer to 2 decimal places
Answer: 99.79cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 8:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 10, 88, 74, 46, 78, 76, 83, 92. Give your answer to 2 decimal places
Answer: Mean = 68.22, Median = 76, Range = 82