Question Video: Finding the Missing Numbers in Addition and Subtraction Expressions Using Models Mathematics • Kindergarten

There are 4 red birds and 2 yellow birds. Fill in the blanks: 4 + 2 = _. 6 − _ = 2. 2 + _ = 6. 6 − _ = 4.

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Video Transcript

There are four red birds and two yellow birds. Fill in the blanks. Four plus two equals what. Six take away what equals two. Two plus what equals six. And six take away what equals four.

This question is getting us to think about how addition and subtraction facts are linked. We’re told that the picture shows four red birds and two yellow birds. These are two parts that go together to make a whole amount. And in our first question, we can find out what that whole amount is because we’re asked to add the two parts together, four plus two equals what.

To find the answer, we can just count on another two from four: four, five, six. Four plus two equals six. These three numbers belong in a family together because the two parts go together to make a whole. And we’re going to use the numbers four, two, and six in each of the number facts that we need to fill in.

Our second number fact says six take away what leaves us with two. Well, if we look at the model we’ve made out of cubes, we can see the two that we want to have left over at the end. So how many cubes are we going to take away to leave us with this two? One, two, three, four. Six take away four leaves us with two. And we know this because four and two are two parts that go together to make six.

We could keep our model as it is for a moment because our next question says two plus what equal six. Perhaps you can see which one of our three numbers is going to be the answer. But let’s use cubes to model this. What are we going to add to two that gives us a total of six? One, two, three, four. Of course, the number that goes together with two to make six is the number of red birds. Two plus four equals six.

Our final number sentence says six take away what equals four. So, at the end of the subtraction, we want to be left with four. How many do we need to take away? One, two. Two and four are two parts that go together to make a total or whole amount six. And we’ve used these numbers, two, four, and six, to write down some different addition and subtraction facts that are all in the same family. Four plus two equals six. Six take away four equals two. Two plus four equals six. And six take away two equals four.

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