Video Transcript
Olivia and Jennifer want to
represent 6,755 plus 2,648 on a bar model. Olivia used this bar model. Jennifer used this one. Who used the correct bar
model? What is the result of 6,755 and
2,648?
Olivia and Jennifer are trying
to represent 6,755 plus 2,648. We don’t know what the whole
amount or the total is, but we do know both of the parts. One of the parts is 6,755, and
the other is 2,648. So the correct bar model needs
to show our two parts, 6,755 and 2,648. This is Olivia’s bar model. The first part is 6,755 which
is one of our parts, and the second part is 2,648 which is our second part. And Olivia’s drawn a question
mark because we don’t know the total. This looks like the correct bar
model.
This is Jennifer’s bar
model. Her bar model shows one of our
parts, 2,648, but the other part is missing. This part should say 6,755. It looks like Jennifer’s
written this as the whole amount. She’s written this number in
the wrong place. So the person who used the
correct bar model is Olivia. Now, we need to find the result
of 6,755 plus 2,648. And we can use the standard
written method or column addition to help find the result. Let’s start by adding the
ones. Five ones and eight ones gives
us a total of 13 ones, so we need to exchange. Now we can add the tens. Five 10s plus four 10s is nine
10s and one more makes 10 10s. Again, we need to exchange.
Now we can add the
hundreds. Seven 100s and six 100s gives
us 13 100s plus the one we exchanged gives us a total of 14 100s. And we need to exchange
again. Finally, we can add the
thousands. Six plus two is eight plus the
one we exchanged gives us a total of nine 1,000s. 6,755 plus 2,648 equals
9,403. Olivia and Jennifer wanted to
represent 6,755 plus 2,648 using a bar model. Olivia drew the correct bar
model, and the result of 6,755 and 2,648 is 9,403.
