Keystones — Capstone
Five GCSE retrieval questions · 10 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 11
Answer: 4(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 77°. Give your answer to 2 decimal places
Answer: 102.31cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 35, 26, 24, 37, 56, 56. Give your answer to 2 decimal places
Answer: Mean = 36.43, Median = 35, Range = 35