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Equations with Addition and Subtraction—Let's Practice

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Equations with Addition and Subtraction—Let's Practice
CCSS.MATH.CONTENT.4.OA.A.3

Basics on the topic Equations with Addition and Subtraction—Let's Practice

Today we are calculating equations with addition and subtraction with Razzi! This video contains examples to help you further practice and grow confident in this topic.

Transcript Equations with Addition and Subtraction—Let's Practice

Razzi says get these items ready (...) Because today we're going to practice... Equations with Addition and Subtraction. It's time to begin! Solve the following TWO STEP word problem by writing an equation. Ash has sixty-three varieties of plants in their garden. There are twenty-eight varieties of tomatoes and fourteen varieties of squash. The rest of the varieties are peppers. How many different varieties of peppers are there? Pause the video to work on the problem (...) and press play when you are ready to see the solution! The equation is twenty-eight plus (...) fourteen plus (...)

to represent the peppers (...) equals sixty-three. Next, add twenty-eight and fourteen to get (...) forty-two. Last, subtract forty-two from sixty-three (...) to get twenty-one. Did you also get twenty-one? Let's try one more! Solve the following TWO STEP word problem by writing an equation. Samir is saving money for a new bike that costs two hundred seventy-nine dollars. He already has forty-five dollars saved and is given ninety-one dollars for his birthday. How much more money does Samir need to save? Pause the video to work on the problem (...) and press play when you are ready to see the solution! The equation is forty-five plus (...) ninety-one plus (...) to represent the money he needs (...) equals two hundred seventy-nine. Next, add forty-five and ninety-one to get (...)one hundred thirty-six. Last, subtract one hundred thirty-six from two hundred seventy-nine (...) to get one hundred forty-three. Did you also get one hundred forty-three? Razzi had so much fun practicing with you today! See you next time!

Equations with Addition and Subtraction—Let's Practice exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Equations with Addition and Subtraction—Let's Practice.
  • How many sunflowers are there?

    Hints

    Set up the equation like this:

    • 45 + 12 + S = 83
    Solve for S.

    Here is the next step of solving for S.

    • 45 + 12 = 57

    Here is the next step of solving for S.

    • 57 + S = 83

    Here is the next step of solving for S.

    • S = 83 - 57
    What does S equal?

    Solution

    Here are the steps for solving the word problem:

    • 45 + 12 + S = 83
    • 45 + 12 = 57
    • 57 + S = 83
    • S = 83 - 57
    • S = 26
    45 + 12 + 26 = 83

    Marsha collected 26 sunflowers on the hike.

  • Penguins at the aquarium.

    Hints

    Set up the equation like this:

    • 23 + 13 + P = 67
    Solve for P.

    Here is the next step of solving for P.

    • 23 + 13 = 36

    Here is the next step of solving for P.

    • 36 + P = 67

    Here is the next step of solving for P.

    • P = 67 - 36
    What does P equal?

    Solution

    Here are the steps for solving the word problem:

    • 23 + 13 + P = 67
    • 23 + 13 = 36
    • 36 + P = 67
    • P = 67 - 36
    • P = 31
    23 + 13 + 31 = 67

    Elijah saw 31 penguins at the aquarium.

  • How much money does Mohammed need for a camera?

    Hints

    Set up the equation:

    amount saved + amount given for his birthday + amount Mohammed needs to save = total cost

    The first step for solving for S is to add the amount saved and the amount given for his birthday.

    The next step is to subtract the sum of the amount saved and the amount given to Mohammed on his birthday from the total cost.

    Solution

    Here are the steps for solving the word problem:

    • 94 + 114 + S = 235
    • 93 + 114 = 208
    • 208 + S = 235
    • S = 235 - 208
    • S = 27
    94 + 114 + 27 = 235

    Mohammed needs to save 27 dollars.

  • Jamie needs to save money for drums.

    Hints

    The first step for solving for S is to add the amount saved and the amount given on Jamie's birthday.

    The next step is to subtract the sum of the amount saved and the amount given on Jamie's birthday from the total cost.

    Solution

    Here are the steps for solving the word problem:

    • 117 + 143 + S = 321
    • 117 + 143 = 260
    • 260 + S = 321
    • S = 321 - 260
    • S = 61
    117 + 143 + 61 = 321

    Jamie needs to save 61 dollars.

  • Write the equation.

    Hints

    Use S for the amount Mia needs to save.

    Here is how to write the equation:

    amount saved + amount given for a holiday + amount Mia needs to save = total cost

    Solution

    The addends are interchangeable so any order is correct.

    This is how to write the equation.

    * 76 + 100 + S = 249

    This is how you solve the problem:

    • 76 + 100 = 176
    • 176 + S = 249
    • 249 - 176 = 73
    • S = 73
    76 + 100 + 73 = 249

  • A deer ate the garden cucumbers!

    Hints

    The first step for solving for C is by adding the number of strawberries and tomatoes.

    The second step for solving for C is to subtract the total amount from the combined amount of strawberries and tomatoes.

    Once you've solved for C, subtract the amount of cucumbers eaten by the deer.

    Solution

    Here are the steps for solving the two part word problem:

    • 43 + 78 + C = 141
    • 43 + 78 = 121
    • 121 + C = 141
    • C = 141 - 121
    • C = 20
    • 20 - 16 = 4
    There are 4 cucumbers left.