Keystones — Capstone
Five GCSE retrieval questions · 13 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 1
Answer: 2(x + 3)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 189.7cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 36, 63, 74, 69, 78, 46, 55, 58. Give your answer to 2 decimal places
Answer: Mean = 60.33, Median = 63, Range = 42