Completing Four-Digit Addition Equations

So far, you’ve learned how to complete equations with a missing addend when all the numbers have three digits.

Let’s figure out how to do this with four-digit numbers!

Let’s try this problem:

1,324 + ______ = 3,746

Let’s start by writing the problem in **column form**:

This problem tells us that 1,324 plus something equals 3,746.

How do we find the missing number? 🤔

We move the sum to the top of the equation!

When we move the sum to the top, we change the sign to subtraction. Now, our equation looks like this:

Let’s solve our subtraction problem:

2,433. That’s it! ✅

Now, the difference becomes the missing number in our equation:

Let’s put this back into our original equation to check if it’s true.

1,324 + 2,422 = 3,746

Great job!

Let’s try another one!

______ + 5,709 = 9,216

Start by stacking the numbers:

Something plus 5,709 equals 9,216. What should we do next!

Make a subtraction problem! That’s right! ✅

What will the top number in our subtraction problem be?

9,216! That’s right.

Now, we can subtract 9,216 – 5,709.

Don’t forget to regroup in this problem!

What did you get? 3,507! That’s it!

Let’s put 3,507 in our original problem so we can check it.

Great job! 🎉 Now, you know how to complete an addition sentence when a four-digit number is missing!

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