Keystones — Capstone
Five GCSE retrieval questions · 25 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√50
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 65°. Give your answer to 2 decimal places
Answer: 266.45cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 77, 18, 60, 94, 44, 46, 30, 28. Give your answer to 2 decimal places
Answer: Mean = 47.22, Median = 44, Range = 76