Keystones — Capstone
Five GCSE retrieval questions · 21 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 8
Answer: 4(x + 4)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 65°. Give your answer to 2 decimal places
Answer: 171.29cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 58, 94, 50, 31, 72, 30, 85
Answer: Mean = 56.5, Median = 54, Range = 64