Keystones — Capstone
Five GCSE retrieval questions · 15 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 13
Answer: 3(x + 2)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 78°. Give your answer to 2 decimal places
Answer: 117.38cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 47, 92, 100, 87, 36, 41, 36. Give your answer to 2 decimal places
Answer: Mean = 62.88, Median = 55.5, Range = 64