Keystones — Capstone
Five GCSE retrieval questions · 5 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 11
Answer: 3(x + 3)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 61°. Give your answer to 2 decimal places
Answer: 201.16cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 3:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 50, 17, 37, 62, 99, 78. Give your answer to 2 decimal places
Answer: Mean = 51.86, Median = 50, Range = 82