Keystones — Capstone
Five GCSE retrieval questions · 12 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 11
Answer: 5(x + 3)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 52°. Give your answer to 2 decimal places
Answer: 164.69cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 14:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 53, 14, 47, 79, 70, 99, 59, 14. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 53, Range = 85