Question Video: Modelling the Commutative Property with Pictures in Word Problems | Nagwa Question Video: Modelling the Commutative Property with Pictures in Word Problems | Nagwa

Question Video: Modelling the Commutative Property with Pictures in Word Problems Mathematics • Second Year of Primary School

On Monday, Isabella got 2 stickers for her reward chart, and on Tuesday, she got 3 stickers. On Monday, Mason got 3 stickers for his reward chart, and on Tuesday, he added two more. Who has more stickers?

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Video Transcript

On Monday, Isabella got two stickers for her reward chart. And on Tuesday, she got three stickers. On Monday, Mason got three stickers for his reward chart. And on Tuesday, he added two more. Who has more stickers?

This question is about two reward charts for two different children, Isabella and Mason. Let’s look at Isabella’s reward chart first. We’re told that on Monday, she got two stickers for her chart. And if we look at the row for Monday on Isabella’s chart, we can see those two stickers that she got. We’re then told that on Tuesday, she got three stickers. And again, we can look on her chart and we can see those three stickers.

Now, the question that we’re asked at the very end of this is, who has more stickers? So let’s think about how we might find the total of Isabella’s stickers. She started off with two on Monday and then was given another three. So we’re going to need to find the answer to two plus three. But before we do that, let’s have a look at Mason’s reward chart. On Monday, he got three stickers for his chart. And then we’re told that on Tuesday, he added two more. So which two numbers are we going to need to add together to find the total of Mason’s stickers?

He starts off with three and then adds two more. Can you see something interesting about these two additions? They both contain the same numbers. They’re just added in a different order, two plus three and then three plus two. Now, what do we know about numbers if they’re added in a different order?

Well, they give the same total. It doesn’t matter which order we add two numbers. Two plus three is the same as three plus two. So if Isabella starts with two and then counts on three, four, five, this is exactly the same as if Mason starts with three and counts on another four, five. They both have five stickers. And so who has more stickers? They have the same number.

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