Problem 50 Subtract, then check the answer ... [FREE SOLUTION]

91影视

Prealgebra

Julie Miller, Molly O鈥橬eill, Nancy Hyde

$Math Studyset 91影视 Explanations$ Math

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Chapter 1: Problem 50

Subtract, then check the answer by using addition. $$7-2 \quad \text { Check: } \square+2=7$$

Short Answer

Expert verified

The answer to 7 - 2 is 5. The check confirms it as 5 + 2 = 7.

Step by step solution

Perform the Subtraction

To solve the problem, begin by subtracting 2 from 7. So, calculate 7 - 2.

Write the Result

The result of the subtraction is: 7 - 2 = 5.

Check by Using Addition

To check the answer, use the addition problem given: \[ \text{square} + 2 = 7 \ \text{Replace the square with the subtraction answer:} \ 5 + 2 = 7. \ This confirms that the subtraction was done correctly.\]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Subtraction

Subtraction is one of the basic operations in math. It is taking one number away from another. For example, in the exercise, we are asked to subtract 2 from 7. To do this, we perform the calculation: \[ 7 - 2 = 5. \] This tells us that if we take 2 away from 7, we're left with 5. This process can be visualized using objects or a number line to help understand the concept better. For instance, imagine having 7 apples and giving away 2; you would have 5 apples left.

Addition

Addition is the process of finding the total or sum by combining two numbers. For example, knowing the answer to our subtraction problem, we can do a simple addition to cross-check. We were provided the equation: \[ \text {square} + 2 = 7 \] By replacing the 'square' with our subtraction result (5), we get: \[ 5 + 2 = 7 \] If done correctly, both the addition and the initial subtraction will hold true. Adding is the opposite of subtracting, and seeing both sides can give more clarity on how one operation checks the other.

Checking Subtraction with Addition

This step is important to verify our subtraction result. It is straightforward. Once we have the result of our subtraction (5), we can add 2 back to it to see if we reach the original number (7). This looks like: \[ 5 + 2 = 7 \] If our subtraction was right, the addition should match the original number. Think about it like retracing your steps to ensure you are correct. If subtraction was driving one way, checking with addition is like driving back to confirm your route.

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91影视

Subtract, then check the answer by using addition. $$7-2 \quad \text { Check: } \square+2=7$$

Short Answer

Step by step solution

Perform the Subtraction

Write the Result

Check by Using Addition

Key Concepts

Subtraction

Addition

Checking Subtraction with Addition

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