Odd one out: Increased

Explanation:

Increased is the odd one out because it is the only word that represents a verb, while the other options (Sum, Plus, Difference) are all nouns.

1. Sum:
- A sum is the result of adding two or more numbers together. It is a noun that represents the total amount or quantity obtained by addition. For example, in the equation 2 + 3 = 5, the sum is 5.

2. Plus:
- Plus is a word used to indicate addition or the positive value of a number. It is also a noun that represents the act of adding something. For example, in the equation 4 + 2 = 6, the plus sign (+) indicates addition.

3. Increased:
- Increased is a verb that represents the action of making something larger or greater in size, quantity, or degree. It is the odd one out in this list as it does not represent a noun like the other options. For example, if the temperature increases, it becomes higher.

4. Difference:
- Difference is a noun that represents the result of subtracting one number or quantity from another. It indicates the amount by which two things differ or vary. For example, the difference between 8 and 3 is 5.

In summary, Increased is the odd one out because it is a verb, while the other options are all nouns representing mathematical concepts.