Video: Using Part-Whole Models to Compare Addition Expressions

We can compare numbers and sums. Which is greater? [A] 7 [B] 6. Which is greater? [A] 2 + 5 [B] 4 + 2

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Video Transcript

We can compare numbers and sums. Which is greater, seven or six? Which is greater, two plus five or four plus two?

We’re shown two models which represent two sums. The total of the first sum is seven. And the total of the second sum is six. What did we add together to give us a total of seven? Well, we have two orange bricks and five pink bricks. Two plus five makes seven. If we start at two and count forward five, that should take us to seven. Two plus one, two, three, four, five. We landed on number seven.

What did we add together to give us a total of six? Well, we have four green blocks and two orange blocks. Four plus two is six. If we start at four and count forward two more, five, six, we can see that seven is one more than six. So, seven is greater than six.

So, the answer to the first part of the question, which is greater, seven or six, is seven. And we also know the answer to the second part of the question. Which is greater, two plus five or four plus two? We know that two plus five is greater than four plus two because two plus five is seven and four plus two is six. The answers are seven and two plus five.

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