Keystones — Capstone
Five GCSE retrieval questions · 11 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 14
Answer: 5(x - 5)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 21cm, angle = 57°. Give your answer to 2 decimal places
Answer: 246.57cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 40:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 38, 18, 72, 50, 77, 41
Answer: Mean = 44, Median = 41, Range = 65