Keystones — Capstone
Five GCSE retrieval questions · 20 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 6
Answer: 5(x - 4)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 19cm, angle = 70°. Give your answer to 2 decimal places
Answer: 249.96cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 57, 94, 27, 87, 68, 24, 97, 79. Give your answer to 2 decimal places
Answer: Mean = 63.56, Median = 68, Range = 73