Keystones — Capstone
Five GCSE retrieval questions · 30 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 10
Answer: 4(x + 1)² + 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 23cm, angle = 44°. Give your answer to 2 decimal places
Answer: 215.69cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 41, 93, 64, 80, 52, 54, 40
Answer: Mean = 56.5, Median = 53, Range = 65