Keystones — Capstone
Five GCSE retrieval questions · 26 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 5
Answer: 2(x - 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 43°. Give your answer to 2 decimal places
Answer: 265.98cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 24:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 60, 33, 53, 92, 25, 15. Give your answer to 2 decimal places
Answer: Mean = 50.86, Median = 53, Range = 77