Lesson Video: Comparing Addition Sentences | Nagwa Lesson Video: Comparing Addition Sentences | Nagwa

# Lesson Video: Comparing Addition Sentences Mathematics • First Year of Primary School

In this video, we will learn how to compare two addition sentences with sums up to 10 by modeling and comparing the parts.

06:34

### Video Transcript

In this video, we will learn how to compare addition sentences with sums up to 10 by modeling and comparing the parts.

We can use the symbols less than, equal to, and greater than to compare numbers. Six is less than eight. Three is equal to three. Nine is greater than four. We can also use these symbols to help us compare addition sentences. For example, one plus two is less than two plus two. One counter and two more counters makes three altogether. Two plus two is four. So, we can say that one plus two is less than two plus two. We can tell that one plus two is less than two plus two without even adding. These parts both contain two counters. This part has one counter, but this part has two. One is less than two. So, we know that one plus two is less than two plus two. Let’s practice comparing addition sentences.

We can compare numbers and sums. Which is greater, seven or six?

We’re shown two different part-whole models. The first shows the number seven, and the second shows the number six. We have to work out which is greater, seven or six? Let’s compare the parts. The first part, which makes seven, contains two bricks. How many parts are in the second part? Let’s count. One, two, three, four, five. Two plus five makes seven.

Let’s look at the parts which make the number six. This part contains two bricks. It’s the same as this part, which also has two bricks. One of the parts which make seven plus one of the parts which make six are the same. Let’s count the bricks in the second part to make six. One, two, three, four. Four and two make six.

Both numbers are made using a part containing two blocks: two plus five and two plus four. Five is one more than four. Five is greater than four. So, we know that this part is worth more than this part. The number which is greater is number seven. Seven is greater than six.

Which is greater, two plus five or four plus two?

We know that five is greater than four and two is equal to two. Because five is greater than four, we can say that two plus five is greater than four plus two. We didn’t need to add. We just needed to compare the size of the parts. Two plus five is greater than four plus two.

Pick the correct symbol to compare the sums. Three plus two is equal to, less than, or greater than one plus four. Hint: Make models and think about the sums. Three and two is what? One and four is what?

We have to compare two sums or two addition sentences, three plus two and one plus four. We have to pick the correct symbol to compare them. It could be equal to, less than, or greater than. We’re given a hint. We’re told to make models and think about the sums. Our first part-whole model shows two parts, three and two. This model shows the sum three plus two, but we don’t know the total. Let’s use a model to help us find the total. Let’s use a five frame and some counters.

Three and two make five, and one plus four also makes five. Both sums equal five. So, the correct symbol is equal to. Three plus two is equal to one plus four. Both sums give us a total of five. So, the correct symbol to compare the sums is the equal to symbol.

What have we learned in this video? We found two ways to compare addition sentences. We could compare the parts or find the total using models.

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