Keystones — Capstone
Five GCSE retrieval questions · 1 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√40
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 12
Answer: (x + 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 74°. Give your answer to 2 decimal places
Answer: 181.68cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 32, 65, 26, 78, 69, 55, 75. Give your answer to 2 decimal places
Answer: Mean = 53.13, Median = 60, Range = 53