Keystones — Capstone
Five GCSE retrieval questions · 26 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 5x
Answer: (x - 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 68°. Give your answer to 2 decimal places
Answer: 102.45cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 24:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 84, 31, 49, 43, 66, 68. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 49, Range = 53