Keystones — Capstone
Five GCSE retrieval questions · 3 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 15
Answer: 3(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 67°. Give your answer to 2 decimal places
Answer: 248.54cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 37, 70, 97, 94, 91, 17. Give your answer to 2 decimal places
Answer: Mean = 70.43, Median = 87, Range = 80