# Equations with Addition and Subtraction

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Information about the video
**Equations with Addition and Subtraction**

### Contents

- Equations with Addition and Subtraction
- How to Solve Equations Using Addition and Subtraction
- Equations with Addition and Subtraction Summary

In this video, Mr. Squeaks just finished an experiment that has gone wrong! He has turned himself into the evil Dr. Squeaks! Imani has to follow the instructions to turn him back. Let’s help Imani by learning how to solve equations with addition and subtraction!

### Equations with Addition and Subtraction

#### What is an Equation?

An **equation** tells us that the expression on either side of the equal sign is equal to the other. Sometimes, when writing an equation, you may have an unknown value that you need to solve for. A **variable** is a letter used to represent the value that we're solving for.

Equations can be used to solve word problems by following these steps:

- Step 1: Read the word problem
- Step 2: Highlight the important information
- Step 3: Identify the operation
- Step 4: Write the equation using a variable to represent the unknown value
- Step 5: Solve the equation

### How to Solve Equations Using Addition and Subtraction

How do you solve addition and subtraction equations? Let’s take a look at the example from the video:

In order to reverse the experiment, Imani needs seventy-eight ingredients altogether. The directions say they need twenty-four jars of mist and fourteen rose petals. The rest of the ingredients they need are crystals. How many crystals does Imani need?

Our equation is: twenty-four jars of mist plus fourteen rose petals plus **c** equals seventy-eight because if we add all the ingredients together, the total number they need is seventy-eight.

#### Let’s Solve

First, we add twenty four jars of mist and fourteen rose petals to get thirty-eight, but we still don't know how many crystals we need!

This is an addition equation, but since we do not know the value of **c**, we need to practice solving an addition equation using inverse operations.

The inverse operation of addition is subtraction, so we subtract thirty-eight from the number of ingredients in total, which is seventy-eight. Seventy-eight minus thirty-eight is forty, and we write the answer using the variable **c** equals forty.

### Equations with Addition and Subtraction Summary

Remember an **equation** tells us that the expression on either side of the equal sign is EQUAL to the other. Equations can be used to solve word problems. When writing the equation we use a **variable** to represent the unknown value. Sometimes when solving equations with addition and subtraction you may have to use the inverse operation to find the answer.
Always include the variable in your answer using an equal sign.

Want some more solving equations with addition and subtraction practice? On this website there is a solving equations with addition and subtraction worksheet along with other activities, and exercises.

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Transcript
**Equations with Addition and Subtraction**

Transkripte - DACH Prozess Transkripte - DACH Prozess 100% 10 C2:J100

Mr. Squeaks has time traveled to England and is spending a lot of time in this lab doing experiments. "Mr. Squeaks! What have you done?!" "Now I am Doctor Squeaks, if you want Mr. Squeaks back, you'll have to follow these directions!" In order for Imani to change Doctor Squeaks back to Mr. Squeaks, they need to follow the directions and solve... Equations with Addition and Subtraction. An equation tells us that the expression on either side of the equal sign (...) is EQUAL to the other. Equations can be used to solve word problems. First, Read the word problem. As you read, think; 'what do I need to find?'... and highlight the question you need to solve! For example... in order to reverse the experiment, Imani needs seventy-eight ingredients altogether. The directions say they need twenty-four jars of mist and fourteen rose petals. The rest of the ingredients they need are crystals. How many crystals does Imani need? Here we highlight “How many crystals does Imani need?”... because it asks us to find how many crystals are needed to reverse the experiment. Now, reread and think; 'What is the important information?' While rereading, highlight keywords, numbers, or units of measurement, that will help answer the question. In the first sentence... highlight seventy-eight ingredients altogether, (...) because this tells us the total number of ingredients they need. In the next sentence, highlight twenty-four jars of mist and fourteen rose petals (...) because this tells us how much of each ingredient they need. Also highlight, the rest of the ingredients they need are crystals (...) because that is the unknown value, or what we're trying to figure out. Then, identify the operation. We can't identify the operation just yet, so we move on to the next step. The next step is to write the equation using a VARIABLE to represent the unknown value. A variable is a letter used to represent the value that we're solving for. Our equation is: twenty-four jars of mist plus fourteen rose petals plus

Mr. Squeaks has time traveled to England and is spending a lot of time in this lab doing experiments. "Mr. Squeaks! What have you done?!" "Now I am Doctor Squeaks, if you want Mr. Squeaks back, you'll have to follow these directions!" In order for Imani to change Doctor Squeaks back to Mr. Squeaks, they need to follow the directions and solve... Equations with Addition and Subtraction. An equation tells us that the expression on either side of the equal sign (...) is EQUAL to the other. Equations can be used to solve word problems. First, Read the word problem. As you read, think; 'what do I need to find?'... and highlight the question you need to solve! For example... in order to reverse the experiment, Imani needs seventy-eight ingredients altogether. The directions say they need twenty-four jars of mist and fourteen rose petals. The rest of the ingredients they need are crystals. How many crystals does Imani need? Here we highlight “How many crystals does Imani need?”... because it asks us to find how many crystals are needed to reverse the experiment. Now, reread and think; 'What is the important information?' While rereading, highlight keywords, numbers, or units of measurement, that will help answer the question. In the first sentence... highlight seventy-eight ingredients altogether, (...) because this tells us the total number of ingredients they need. In the next sentence, highlight twenty-four jars of mist and fourteen rose petals (...) because this tells us how much of each ingredient they need. Also highlight, the rest of the ingredients they need are crystals (...) because that is the unknown value, or what we're trying to figure out. Then, identify the operation. We can't identify the operation just yet, so we move on to the next step. The next step is to write the equation using a VARIABLE to represent the unknown value. A variable is a letter used to represent the value that we're solving for. Our equation is: twenty-four jars of mist plus fourteen rose petals plus

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