Keystones — Capstone
Five GCSE retrieval questions · 13 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 5x² + 30x
Answer: 5(x + 3)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 43°. Give your answer to 2 decimal places
Answer: 204.6cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 9:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 14, 12, 51, 30, 81, 92, 54
Answer: Mean = 53, Median = 52.5, Range = 80