Keystones — Capstone
Five GCSE retrieval questions · 8 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² + 7x - 12
Answer: (x + 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 76°. Give your answer to 2 decimal places
Answer: 147.48cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 10:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 58, 13, 55, 38, 23, 31, 57. Give your answer to 2 decimal places
Answer: Mean = 45.13, Median = 46.5, Range = 73