Question Video: Finding the Total Number of Objects in Two Groups by Counting and Identifying the Related Addition Sentence | Nagwa Question Video: Finding the Total Number of Objects in Two Groups by Counting and Identifying the Related Addition Sentence | Nagwa

# Question Video: Finding the Total Number of Objects in Two Groups by Counting and Identifying the Related Addition Sentence Mathematics • First Year of Primary School

David has 4 black cats and 2 white cats. How many cats does he have in total? Find the matching number sentence. [A] 4 + 2 = 5 [B] 3 + 2 = 5 [C] 4 + 2 = 6 [D] 4 + 3 = 7

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### Video Transcript

David has four black cats and two white cats. How many cats does he have in total? Find the matching number sentence. Four plus two equals five, three plus two equals five, four plus two equals six, or four plus three equals seven.

Let’s start by reading through our word problem again carefully so that we understand what it’s asking us. To begin with, we’re told that David has four black cats and two white cats. Let’s underline these numbers; they could be useful. And underneath, we can see a picture of David’s four black cats and two white cats. And then we’re asked, how many cats does he have in total? There’s a clue in this question which tells us what we need to do to find the answer. When we find the total of something, we need to add to find the answer. So in this problem, we need to add together four and two.

Let’s model the problem. We could use black and white cubes, couldn’t we? Four black cubes representing the four black cats and then two white cubes representing our two white cats. So to find the number of cats that David has in total, we need to add on another two to four. This means we can just count on from four. We know we have four black cubes, so we then have five, six cubes altogether. David has a total of six cats. Although our problem was in words, we can represent it using a number sentence. And we need to find the matching number sentence. Do you remember what we did to find the answer? We added together four and two.

Out of the different additions, we can see that only two of them show four plus two. But which one’s correct? Four plus two equals five or four plus two equals six. We’ve already found the answer, so we know that the matching number sentence is four plus two equals six. David has six cats in total, and the matching number sentence is four plus two equals six.

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