Letters and Symbols Practice
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Letters and Symbols Practice
📚 Understanding Letters and Symbols
What are algebraic expressions?
In mathematics, we use letters (like x, y, a, b) to represent unknown numbers or variables. We combine these with numbers and mathematical symbols to create expressions.
Example 1: Writing expressions
• "5 more than a number x" = x + 5
• "3 times a number y" = 3y (we don't need to write 3 × y)
• "A number n decreased by 7" = n - 7
Example 2: Substituting values
If x = 4, find the value of 2x + 3:
Step 1: Replace x with 4 → 2(4) + 3
Step 2: Calculate → 8 + 3 = 11
Example 3: Simplifying expressions
Simplify: 3x + 2x + 5
Step 1: Collect like terms → (3x + 2x) + 5
Step 2: Add the x terms → 5x + 5
✏️ Practice Questions
🎯 Challenge Problems
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