Keystones — Capstone
Five GCSE retrieval questions · 5 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 12
Answer: 4(x + 4)² - 52 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 42°. Give your answer to 2 decimal places
Answer: 156.58cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 93, 66, 85, 67, 83, 82, 50. Give your answer to 2 decimal places
Answer: Mean = 68.13, Median = 74.5, Range = 74