Keystones — Capstone
Five GCSE retrieval questions · 24 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 7
Answer: 4(x - 6)² - 137 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 223.09cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 20, 58, 62, 38, 21, 27. Give your answer to 2 decimal places
Answer: Mean = 42.57, Median = 38, Range = 52