Keystones — Capstone
Five GCSE retrieval questions · 24 September 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√275
Answer: 25√11 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 15
Answer: 3(x - 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 77°. Give your answer to 2 decimal places
Answer: 266cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 56, 31, 41, 14, 32, 67, 26. Give your answer to 2 decimal places
Answer: Mean = 43.63, Median = 36.5, Range = 68