Keystones — Capstone
Five GCSE retrieval questions · 26 December 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 8
Answer: 3(x - 4)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 12cm, angle = 70°. Give your answer to 2 decimal places
Answer: 84.57cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 74, 31, 98, 96, 28, 38, 65, 34. Give your answer to 2 decimal places
Answer: Mean = 57.67, Median = 55, Range = 70