Keystones — Capstone
Five GCSE retrieval questions · 15 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 14
Answer: 3(x + 4)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 47°. Give your answer to 2 decimal places
Answer: 235.5cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 54, 27, 54, 71, 46, 96, 65, 42
Answer: Mean = 61, Median = 54, Range = 69