Keystones — Capstone
Five GCSE retrieval questions · 28 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 14
Answer: 3(x + 4)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 56°. Give your answer to 2 decimal places
Answer: 143.01cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 90, 15, 50, 85, 73, 85. Give your answer to 2 decimal places
Answer: Mean = 62.29, Median = 73, Range = 75