Subtract Using Addition — Let's Practice!
- Using Addition to Subtract – Introduction
- What Does it Mean to Use Addition to Subtract?
- Using Addition to Subtract – Example
- Using Addition to Subtract – Guided Practice
- Using Addition to Subtract – Application
- Using Addition to Subtract – Examples
- Using Addition to Subtract – Summary
- Using Addition to Subtract – Frequently Asked Questions
Basics on the topic Subtract Using Addition — Let's Practice!
Using Addition to Subtract – Introduction
Get ready because today we're going to practice using addition to subtract. It’s a helpful way to understand subtraction better by using addition. Ready to begin? Let's go!
What Does it Mean to Use Addition to Subtract?
Using addition to subtract means using mental math and turning a subtraction problem into an addition problem to make it easier to solve.
For example, if you have the subtraction problem 35 - 15, you can flip it to create an addition problem: 15 + ? = 35. This method can help you find the missing number more easily. Let’s practice this with some problems!
Using Addition to Subtract – Example
Let's solve a problem using addition to subtract:
Problem
If Alex has 35 nails but only needs 15, how many will he have left?
Solution
Follow these simple steps to find the solution.
| Step | Explanation | Result |
|---|---|---|
| Create the subtraction equation | 35 - 15 | |
| Flip to create the addition equation | 15 + ? = 35 | |
| Solve the addition equation | 15 + 20 = 35 | 20 |
So, 35 minus 15 equals 20! Alex will have 20 nails left.
Using Addition to Subtract – Guided Practice
Let's try another problem together.
Problem
If Imani has 47 screws but only uses 23, how many are left?
So, 47 minus 23 equals 24! Imani will have 24 screws left.
Using Addition to Subtract – Application
Now, try solving this problem on your own:
Problem If Mia has 96 nuts, but 34 get eaten, how many are left?
So, 96 minus 34 equals 62! Mia will have 62 nuts left.
Using Addition to Subtract – Examples
To help yourself in becoming fluent in using addition to subtract, have a look at some more examples and complete them by following the steps.
| Problem | Subtraction Equation | Addition Equation | Solution |
|---|---|---|---|
| 35 - 15 | 35 - 15 | 15 + ? = 35 | 20 |
| 47 - 23 | 47 - 23 | 23 + ? = 47 | 24 |
| 96 - 34 | 96 - 34 | 34 + ? = 96 | 62 |
| 82 - 34 | 82 - 34 | 34 + ? = 82 | 48 |
Using Addition to Subtract – Summary
Key Learnings from this Text:
- Using addition to subtract helps us understand subtraction by turning it into an addition problem.
- It is a helpful method to subtract without using a calculator or a written method.
- Create a subtraction equation and then flip it to create an addition equation.
- Solve the addition equation to find the missing number.
Keep practicing using addition to subtract to become a math whiz! Check out more fun math problems and activities on our website, such as subtraction using compensation, using place value to subtract, or using number lines to subtract.
Using Addition to Subtract – Frequently Asked Questions
Transcript Subtract Using Addition — Let's Practice!
Razzi says get these items ready (...) Because today we're going to practice... "Subtract using addition". There are many strategies to solve subtraction equations. One is using addition! It's time to begin! If Mr. Squeaks has thirty-five nails but only needs fifteen, how many will he have left? Remember, start by creating a subtraction equation. Then, flip it to create an addition equation! Once you create the addition equation, solve to find the answer! Did you also get twenty? Let's tackle the next problem! If Imani has forty-seven screws but only uses twenty-three, how many are left? Our sutraction equation is forty-seven minus twenty-three... that means our addition equation is twenty-three plus what equals forty-seven. Once you create the addition equation, solve to find the answer! Did you also get twenty-four? Let's tackle the next problem! If Mr. Squeaks has ninety-six nuts, but thirty-four get eaten, how many are left? Remember to create a subtraction equation... and then flip it to create an addition equation. Once you create the addition equation, solve to find the answer! Did you also get sixty-two? Let's tackle the last problem! If Mr. Squeaks finds eighty-two buttons but only needs thirty-four, how many are left? Remember to create a subtraction equation... and then flip it to create an addition equation Finally, solve to find the answer! Did you also get forty-eight? Razzi had so much fun practicing with you today! See you next time!
Subtract Using Addition — Let's Practice! exercise
-
How would we solve this problem?
HintsThe first step is to find the subtraction equation you are trying to solve.
You can then turn the subtraction equation into an addition equation.
Count up to find the answer before filling it in.
Solution- Start with a subtraction equation: 28 - 14 = __
- Flip it to make an addition equation: 14 + __ = 28
- Count up to find the answer.
- Fill in the correct answer: 14 + 14 = 28
-
How many bolts will Mr. Squeaks have left?
HintsWhat is the subtraction equation you are trying to solve?
The subtraction equation is 46 - 33 = ?.
How can this be made into an addition equation?
We can change this to 33 + __ = 46.
Count up from 33 to reach 46.
SolutionThe subtraction equation being solved is 46 - 33 = ?.
We can flip this to 33 + __ = 46.
Count up from 33 to 46.
33 + 13 = 46
46 - 33 = 13
-
Can you solve these subtraction problems?
HintsCount up from the smaller number to the larger number.
Double check your answers by subtracting the smaller number from the larger number.
Solution1.) 24 - 11 = ?
11 + 13 = 24
24 - 11 = 13
2.) 54 - 37 = ?
37 + 17 = 54
54 - 37 = 17
3.) 68 - 35 = ?
35 + 33 = 68
68 - 35 = 33
-
What is the missing number?
HintsIf you are solving an addition equation, count up from the smaller number to the larger number.
Perform the inverse, or opposite, operation to check your answers.
If you are solving a subtraction equation, you can flip it into an addition equation and then solve it.
Solution27
- 61 - 34 = 27
- 84 - 57 = 27
- 29 + 27 = 56
- 60 - 29 = 31
- 84 - 53 = 31
- 25 + 31 = 56
- 94 - 51 = 43
- 32 + 43 = 75
- 61 - 18 = 43
-
How many pieces of cheese are left?
HintsThe subtraction equation we are trying to solve is 20 - 9 = ?.
We can flip this to 9 + __ = 20.
Count up from 9 to 20.
Use this number line to help you.
SolutionMr Squeaks has 11 pieces of cheese left.
20 - 9 = ?
9 + __ = 20
9 + 11 = 20
20 - 9 = 11
-
Can you solve the problems?
HintsWork out what the subtraction equation is for each problem.
Flip it to an addition equation and count up to solve.
For the first question, the subtraction equation is 60 - 11 = ?
We can flip this to 11 + __ = 60.
Solution- Sally started counting down to her birthday when there were 60 days to go. Now there are only 11 days to go. 49 days have passed.
- The bakery made 98 cheese straws in the morning and sold 76. They have 22 cheese straws left.
- Dave has to wash 113 windows in a day. He has done 84 so far and has 29 left to go.
Order in Adding
Using Make Ten to Add
Compensation in Addition
Compensation in Addition — Let's Practice!
Subtract Using Addition — Let's Practice!
Make a Number Line to Add — Let's Practice!
Adding Four Two Digit Numbers
Using Place Value to Subtract (Regrouping)
Using Place Value to Add Two Digit Numbers (No Regouping)
