Keystones — Capstone
Five GCSE retrieval questions · 20 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 15
Answer: 4(x - 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 165.82cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 82, 48, 70, 32, 90, 36, 43, 99. Give your answer to 2 decimal places
Answer: Mean = 57.67, Median = 48, Range = 80