Keystones — Capstone
Five GCSE retrieval questions · 21 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 74°. Give your answer to 2 decimal places
Answer: 242.24cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 95, 68, 23, 73, 37, 16, 23. Give your answer to 2 decimal places
Answer: Mean = 44.88, Median = 30.5, Range = 79