Here are the answers for the crossword clues based on the provided image:

1. Simplifying expression by combining like parts: Combining
   (This likely refers to the concept of "combining like terms.")

2. Expression without an equality sign: Expression
   (This might directly point to an expression, as it differs from equations.)

3. The value that makes an equation true: Solution

4. Removing parts of expression to find an answer: Simplify

5. Symbol for 'less than' in expressions: <

6. Mathematical operation between terms: Operator

7. Number added or subtracted in an expression: Constant

Would you like a detailed explanation for any of these, or help with related concepts?

Here are 5 related questions to expand your understanding:

1. What is the difference between an expression and an equation?
2. How do we combine like terms in algebraic expressions?
3. Why is it important to simplify expressions before solving equations?
4. What are some common operators in mathematics, and how are they used?
5. How can we identify constants versus variables in an expression?

Tip: Always check if terms are "like terms" before combining; they must have the same variable raised to the same power.