Keystones — Capstone
Five GCSE retrieval questions · 27 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 14
Answer: 4(x + 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 211.32cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 14:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 89, 55, 50, 36, 68, 81, 70. Give your answer to 2 decimal places
Answer: Mean = 60.88, Median = 61.5, Range = 53