The portal has been deactivated. Please contact your portal admin.

Question Video: Subtracting Two-Digit Numbers Using Number Lines by Making Jumps of Tens and Ones Mathematics • 2nd Grade

By counting back in tens and ones on a number line, find 54 − 29.

02:53

Video Transcript

By counting back in 10s and ones on a number line, find 54 take away 29.

In this question, we need to subtract two two-digit numbers. We need to find the answer to 54 take away 29. And we’re told how to find the answer. We need to count back in 10s and ones on a number line. And we can see part of a number line below where the answer has started to be worked out. What’s being marked on the number line already? Well, firstly, we can see the number 54. This is the number that we’re beginning with. We need to take away 29 from this number. So we need to count backwards from 54.

And we’re told that we need to count back in 10s and ones. Now, if we’re subtracting 29, how many 10s and how many ones do we need to jump back? We know that 29 is the same as two 10s or 20 and nine ones. And this tells us the number of jumps we need to make. We need to count back two 10s and then nine ones. Let’s count back two 10s to begin with. So, we’re gonna start with the number 54. And we can see that our first jump of 10 is marked on the number line already. If we count back 10 from 54, we get 44.

Now, we can see part of the next jump of 10, but we can’t see it all. So let’s complete this next jump of 10. There, we go. We’ll label it minus 10 to remind ourselves what we’ve done. And if we count back 10 from 44, we reach 34. We’ve counted backwards two 10s, and we’ve gone from 54 to 34. Now, we just need to count back nine ones. One, two, three. Can you see how we’re labeling the number line by taking away one each time? 34, 33, 32, 31. Four, five, six, seven, eight, nine. 34, 33, 32, 31, 30, 29, 28, 27, 26, 25.

To find the answer to 54 take away 29, we started on a number line with 54 and then we subtracted 29 by jumping back two 10s and nine ones. The number we ended up on was 25. 54 take away 29 equals 25.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.