If:
Solve the following addition problem:
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If:
Solve the following addition problem:
Let's solve the problem step-by-step:
Step 1: Identify the substitution needed.
We are given that . Thus, we need to solve by substituting with 7.
Step 2: Substitute the value into the addition problem.
The expression becomes .
Step 3: Perform the addition.
To find , add the two numbers:
Thus, the solution to the problem is .
Correct Answer Choice:
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
The circle is a variable - it represents a number! In this problem, we're told that , so wherever you see the circle, replace it with 7.
No! Just treat it like any other variable. The key is to substitute - replace the symbol with its given value, then do normal arithmetic.
That's not a complete solution! You need to evaluate the expression by substituting the value. Think of it like this: if someone asks "What's 5 + x when x = 3?", you can't answer "5 + x" - you must say "8".
Substitute back into the original: . You can also count up from 42: 43, 44, 45, 46, 47, 48, 49. Seven steps up from 42 gets you to 49!
Yes! Any symbol can represent a number: squares , triangles , or letters like x and y. The process is always the same: substitute the given value, then calculate.
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