Keystones — Capstone
Five GCSE retrieval questions · 13 July 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√40
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 4
Answer: 3(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 171.61cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 10:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 77, 74, 65, 56, 69, 69, 92, 22. Give your answer to 2 decimal places
Answer: Mean = 66.89, Median = 69, Range = 70