Keystones — Capstone
Five GCSE retrieval questions · 4 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² - 9x - 3
Answer: (x - 9⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 26cm, angle = 47°. Give your answer to 2 decimal places
Answer: 247.2cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 28, 13, 84, 51, 54, 92, 17, 85. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 54, Range = 79