Keystones — Capstone
Five GCSE retrieval questions · 11 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 2x² + 4x + 14
Answer: 2(x + 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 14cm, angle = 55°. Give your answer to 2 decimal places
Answer: 114.68cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 74, 89, 71, 74, 32, 61, 50
Answer: Mean = 64.5, Median = 68, Range = 57