Keystones — Capstone
Five GCSE retrieval questions · 4 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
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 = 28cm, b = 25cm, angle = 68°. Give your answer to 2 decimal places
Answer: 324.51cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 51, 26, 69, 11, 24, 88, 64, 82. Give your answer to 2 decimal places
Answer: Mean = 47.56, Median = 51, Range = 77