Keystones — Capstone
Five GCSE retrieval questions · 9 February 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 14
Answer: 4(x + 1)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 73°. Give your answer to 2 decimal places
Answer: 167.35cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 22, 16, 27, 85, 21, 55, 80. Give your answer to 2 decimal places
Answer: Mean = 42.63, Median = 31, Range = 69