Keystones — Capstone
Five GCSE retrieval questions · 9 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 3
Answer: 2(x - 2)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 70°. Give your answer to 2 decimal places
Answer: 122.16cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 28, 24, 91, 21, 48, 52. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 48, Range = 75