Keystones — Capstone
Five GCSE retrieval questions · 16 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 2x² + 4x + 13
Answer: 2(x + 1)² + 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 13cm, angle = 41°. Give your answer to 2 decimal places
Answer: 123.67cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 42:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 39, 46, 50, 18, 74, 61, 84
Answer: Mean = 54.5, Median = 55.5, Range = 66