Keystones — Capstone
Five GCSE retrieval questions · 6 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 4
Answer: 3(x + 1)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 55°. Give your answer to 2 decimal places
Answer: 286.7cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 98, 86, 35, 90, 30, 30. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 35, Range = 86