Keystones — Capstone
Five GCSE retrieval questions · 23 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 5x + 9
Answer: (x + 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 21cm, angle = 58°. Give your answer to 2 decimal places
Answer: 267.14cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 93, 20, 11, 69, 85, 27, 72. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 70.5, Range = 83