Keystones — Capstone
Five GCSE retrieval questions · 28 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 15
Answer: 2(x + 4)² - 47 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 28cm, angle = 73°. Give your answer to 2 decimal places
Answer: 388.26cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 14, 14, 35, 35, 84, 89. Give your answer to 2 decimal places
Answer: Mean = 41.14, Median = 35, Range = 75