To solve the expression $100 \div 4 (2+3)$, follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction):

1. Parentheses: First, calculate the expression inside the parentheses: $2 + 3 = 5$

2. Multiplication: The expression becomes: $100 \div 4 \times 5$ According to the order of operations, multiplication and division are performed from left to right. So, divide first: $100 \div 4 = 25$

3. Multiplication: Now multiply: $25 \times 5 = 125$

The final result is $125$.

Would you like more details or have any questions?

Here are 5 related questions:

1. What is the result of $200 \div 8 (3+2)$?
2. How does the order of operations change the outcome if we reverse the operations?
3. How do parentheses influence the calculations in expressions?
4. What would happen if you forgot to divide before multiplying?
5. Can this concept extend to more complex expressions with exponents and roots?

Tip: Always handle parentheses and other grouping symbols first in any mathematical expression!