Keystones — Capstone
Five GCSE retrieval questions · 25 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 13
Answer: 4(x + 6)² - 157 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 78°. Give your answer to 2 decimal places
Answer: 278.77cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 20, 23, 63, 11, 80, 62, 83
Answer: Mean = 49.25, Median = 57, Range = 72