Keystones — Capstone
Five GCSE retrieval questions · 1 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 11
Answer: 5(x - 1)² + 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 76°. Give your answer to 2 decimal places
Answer: 148.46cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 28:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 91, 17, 64, 67, 40, 60, 56. Give your answer to 2 decimal places
Answer: Mean = 57.38, Median = 62, Range = 74