# Missing variable calculation in addition equation

Welcome to our math quiz on missing variable addition! In this quiz, we will practice solving addition problems where one of the numbers is missing.

First, let’s review the basics of addition. In math, we use the plus symbol (+) to show that we are adding two or more numbers together. For example, the equation “3 + 4 = 7” shows that we are adding the numbers 3 and 4 together to get a total of 7.

Now, let’s practice solving missing variable addition problems. In these types of problems, one of the numbers in the equation is missing, and it is our job to figure out what that number is.

Here’s an example:

5 + ? = 9

To solve this problem, we need to find the missing number that will make the equation true. To do this, we can use the fact that the total of any addition equation must be equal to the sum of the two numbers being added.

In this case, the sum of the two numbers being added is 9, so we can subtract the known number (5) from the total to find the missing number.

5 + ? = 9 9 – 5 = 4

So the missing number is 4.

Let’s try another example:

? + 6 = 8

To solve this problem, we can use the same strategy as before. We know that the total of the equation is 8, and one of the numbers being added is 6. So we can subtract 6 from the total to find the missing number.

? + 6 = 8 8 – 6 = 2

So the missing number is 2.

Now it’s your turn to try some missing variable addition problems on your own! See if you can solve the following equations:

- ? + 7 = 10
- 6 + ? = 9
- ? + 8 = 11
- 9 + ? = 15
- ? + 4 = 7

Answers:

- 3
- 3
- 3
- 6
- 3

Great work! You are now a pro at solving missing variable addition problems. Keep practicing to improve your math skills and become even better at solving these types of problems. Happy calculating!