Keystones — Capstone
Five GCSE retrieval questions · 7 May 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 9
Answer: (x - 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 304.62cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 77, 79, 70, 90, 18, 57, 61, 10. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 61, Range = 80