Keystones — Capstone
Five GCSE retrieval questions · 13 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 15
Answer: 3(x + 2)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 46°. Give your answer to 2 decimal places
Answer: 198.18cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 18, 64, 79, 91, 28, 54, 85. Give your answer to 2 decimal places
Answer: Mean = 59.88, Median = 62, Range = 73