Keystones — Capstone
Five GCSE retrieval questions · 9 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 5
Answer: 3(x + 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 53°. Give your answer to 2 decimal places
Answer: 129.78cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 36:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 92, 30, 52, 93, 57, 28. Give your answer to 2 decimal places
Answer: Mean = 64.14, Median = 57, Range = 69