Keystones — Capstone
Five GCSE retrieval questions · 31 December 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√96
Answer: 16√6 -
2. Algebra Completing the square
Complete the square: x² + x + 5
Answer: (x + 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 41°. Give your answer to 2 decimal places
Answer: 155.81cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 30:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 34, 78, 55, 25, 100, 27, 83. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 62, Range = 75