Keystones — Capstone
Five GCSE retrieval questions · 23 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 13
Answer: 4(x + 4)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 62.42cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 42, 93, 61, 86, 50, 18. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 61, Range = 75