Keystones — Capstone
Five GCSE retrieval questions · 2 April 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 65°
Answer: 220.2cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 94, 89, 67, 35, 39, 33
Answer: Mean = 55.6, Median = 39, Range = 62