Keystones — Capstone
Five GCSE retrieval questions · 3 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 3
Answer: 5(x + 5)² - 122 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 68°. Give your answer to 2 decimal places
Answer: 268.88cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 35, 79, 51, 15, 30, 34, 20. Give your answer to 2 decimal places
Answer: Mean = 35.88, Median = 32, Range = 64