Introduction
Classification involves identifying a group of elements that share a common characteristic and spotting the 'Odd One Out' that does not belong to that group. In mathematics, this is based on number properties.
Explanation Step by Step
To solve classification problems: 1. Observe the given numbers. 2. Find a common logic (multiples, squares, etc.) for three numbers. 3. The number that doesn't fit the logic is the answer.
Sub-topics
Numbers
Focuses on patterns like prime numbers, divisibility rules, and digital sums/products.
Examples
Example 1
Example 2
Tricks and Shortcuts
Always check for divisibility by prime numbers like 7, 13, 17, and 19 first. If numbers are large, check the sum of digits immediately.
Common Mistakes
Ignoring the possibility of a multiplication pattern within the digits and only looking for simple addition or subtraction.
Practice Questions
Easy Questions
- 1) 4 2) 9 3) 16 4) 20
- 1) 10 2) 20 3) 35 4) 40
- 1) 33 2) 55 3) 77 4) 89
Medium Questions
- 1) 51 2) 85 3) 102 4) 115
- 1) 123 2) 234 3) 345 4) 457
- 1) 135 2) 246 3) 357 4) 469
Hard Questions
- 1) 5423 2) 6252 3) 8531 4) 5812
- 1) 9811 2) 7611 3) 5411 4) 3212
- 1) 2408 2) 3206 3) 4812 4) 1204
Revision Summary
Mastering classification requires a strong command over tables and number series logic.