Keystones — Capstone
Five GCSE retrieval questions · 27 December 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 2
Answer: 5(x - 4)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 61°. Give your answer to 2 decimal places
Answer: 227.4cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 85, 10, 40, 74, 89, 27, 63, 52. Give your answer to 2 decimal places
Answer: Mean = 55.89, Median = 63, Range = 79