Keystones — Capstone
Five GCSE retrieval questions · 18 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 6
Answer: 2(x + 5)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 65°. Give your answer to 2 decimal places
Answer: 138.67cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 28:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 21, 67, 79, 95, 97, 67, 42. Give your answer to 2 decimal places
Answer: Mean = 68.63, Median = 73, Range = 76