Keystones — Capstone
Five GCSE retrieval questions · 27 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 4
Answer: (x - 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 196.33cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 88, 46, 11, 70, 86, 34
Answer: Mean = 58, Median = 70, Range = 77