Keystones — Capstone
Five GCSE retrieval questions · 2 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 9x + 4
Answer: (x + 9⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 110.74cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 90, 100, 54, 86, 56, 85. Give your answer to 2 decimal places
Answer: Mean = 76.14, Median = 85, Range = 46