Video: Using a Blank Number Line to Add within 1 000

Continue counting on the number line to find the sum. 629 + 153 = _

02:37

Video Transcript

Continue counting on the number line to find the sum. 629 plus 153.

We can add these two numbers using a number line. We need to start at the number 629. And we need to add 153. The number line has already been started. The number 153 has one hundred. 629 has six hundreds. If we add one more, it will have seven. 629 plus 100 is 729. Next, we need to add five tens. 153 has five tens. If we add five tens to our two tens, we will have seven tens. We can see from our number line that one jump of 10 has already been made. We need to make five. So that’s one, two, three, four, five. If we start at 729 and add five tens, 739, 49, 59, 69, 779. That takes us to 779 on the number line. Now, all we have to do is add three ones. The number 153 has three ones. So we need to start at 779 and count forward three more, 780, 781, 782. 629 plus 153 equals 782.

We used the number line to help us count on. We were adding 153, which is one hundred, five tens, and three ones. We counted forward on the number line to find the sum.

629 plus 153 equals 782.

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