Keystones — Capstone
Five GCSE retrieval questions · 14 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 5x² - 60x
Answer: 5(x - 6)² - 180 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 54°. Give your answer to 2 decimal places
Answer: 169.89cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 56, 28, 56, 60, 65, 14. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 56, Range = 80