Keystones — Capstone
Five GCSE retrieval questions · 13 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 7x + 8
Answer: (x + 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 54°. Give your answer to 2 decimal places
Answer: 351.92cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 42:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 46, 56, 27, 39, 70, 14, 49, 66. Give your answer to 2 decimal places
Answer: Mean = 42.78, Median = 46, Range = 56