Definition: Numerical expressions are like math sentences that use numbers and operations (like +, –, ×, ÷). Sometimes, you need to use special symbols like parentheses ( ), brackets [ ], or braces { } to help group numbers together and decide what to do first when solving.
These symbols tell us which parts of the math expression to solve first, so we can find the correct answer.
Example: Let’s say you have this expression:
2+5-1
7-1
6
In real life: Think of it like getting ready in the morning. First, you brush your teeth (inside the parentheses), and then you put on your shoes (outside the parentheses). The order matters!
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