Keystones — Capstone
Five GCSE retrieval questions · 19 December 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 11
Answer: 5(x - 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 171.2cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 70, 61, 30, 68, 14, 98, 62. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 61.5, Range = 84