Keystones — Capstone
Five GCSE retrieval questions · 11 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 15
Answer: 5(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 76°. Give your answer to 2 decimal places
Answer: 122.26cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 40:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 83, 77, 68, 45, 78, 11, 45. Give your answer to 2 decimal places
Answer: Mean = 59.13, Median = 67, Range = 72