Keystones — Capstone
Five GCSE retrieval questions · 10 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 11
Answer: 4(x + 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 203.65cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 26, 46, 31, 66, 69, 70, 18. Give your answer to 2 decimal places
Answer: Mean = 46.63, Median = 46.5, Range = 52