Keystones — Capstone
Five GCSE retrieval questions · 16 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 209.67cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 2:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 100, 29, 21, 80, 96, 13. Give your answer to 2 decimal places
Answer: Mean = 59.57, Median = 78, Range = 87