Video: Operations on Numbers

A train travelled 27786 meters from city A to city B. Then it went back to city A. What is the total distance the train travelled?

03:40

Video Transcript

A train travelled 27786 meters from city A to city B. Then, it went back to city A. What is the total distance the train travelled?

Our train is going to travel from city A to city B. First, we need to know what the distance between city A and city B is. The information we’re given tells us that it’s 27786 meters from city A to city B. However, that is not the question that we’re asked. We need to find out the total distance the train travelled. Our train travelled from city A to city B. And then, it turned around and travelled right back.

This means that the train we’re talking about travelled the 27786-meter journey twice. We can add 27786 to itself. We can also take 27786 meters and multiply that value by two. Starting in the units place, we need to multiply two times six. Two times six is 12. We write down our two and we carry our one. Now, in the tens place, we have two times eight which equals 16. We can’t forget this one we’ve carried over though. That means 16 plus one 17. Bring down the seven and carry the one.

In the hundreds place, there’s a seven. So we say two times seven is 14. There’s a one that we’ve already carried over. 14 plus one is 15. Write down the five, carry the one. In the thousands place is another seven. Two times seven is 14 plus the one that we’ve carried over 15. Write down the five, carry the one.

And last, in our ten thousands place is a two. Two times two is four plus the one that we’ve carried over. Four plus one is five and we’ll bring down a five. 27786 meters times two equals 55572 meters. If you added 27786 meters to itself, you would end up with the same result.

Our train travelled 55572 meters when it travelled from city A to city B and then back to city A.

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