Keystones — Capstone
Five GCSE retrieval questions · 18 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 5
Answer: 2(x - 6)² - 67 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 51°. Give your answer to 2 decimal places
Answer: 136.78cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 65, 41, 88, 96, 55, 50. Give your answer to 2 decimal places
Answer: Mean = 64.71, Median = 58, Range = 55