Keystones — Capstone
Five GCSE retrieval questions · 26 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 8
Answer: 5(x + 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 40°. Give your answer to 2 decimal places
Answer: 192.19cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 88, 92, 59, 46, 13, 81, 58, 71. Give your answer to 2 decimal places
Answer: Mean = 67.22, Median = 71, Range = 84