Keystones — Capstone
Five GCSE retrieval questions · 11 December 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 6
Answer: 3(x + 5)² - 81 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 47°. Give your answer to 2 decimal places
Answer: 217.21cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:10:18 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 34, 72, 99, 87, 61, 22. Give your answer to 2 decimal places
Answer: Mean = 63.57, Median = 70, Range = 77