Keystones — Capstone
Five GCSE retrieval questions · 14 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√44
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 3
Answer: (x + 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 42°. Give your answer to 2 decimal places
Answer: 144.53cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 23, 30, 25, 89, 75, 29. Give your answer to 2 decimal places
Answer: Mean = 43.57, Median = 30, Range = 66