Keystones — Capstone
Five GCSE retrieval questions · 19 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 7
Answer: 3(x - 3)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 25cm, angle = 54°. Give your answer to 2 decimal places
Answer: 171.92cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 31, 31, 11, 32, 37, 14. Give your answer to 2 decimal places
Answer: Mean = 26.29, Median = 31, Range = 26