Keystones — Capstone
Five GCSE retrieval questions · 22 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 13
Answer: 3(x + 5)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 62°. Give your answer to 2 decimal places
Answer: 148.34cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 28:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 95, 97, 65, 72, 32, 16. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 72, Range = 81