Keystones — Capstone
Five GCSE retrieval questions · 2 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 11
Answer: 2(x - 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 181.54cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 24, 23, 45, 53, 17, 48, 90, 57. Give your answer to 2 decimal places
Answer: Mean = 42.78, Median = 45, Range = 73