Keystones — Capstone
Five GCSE retrieval questions · 26 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 9
Answer: 4(x + 5)² - 109 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 70°. Give your answer to 2 decimal places
Answer: 272.51cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 20, 89, 43, 40, 52, 58, 41
Answer: Mean = 52.5, Median = 47.5, Range = 69