Video: Addition of Numbers up to 999

A store sold 790 books on Wednesday and 205 books on Thursday. How many books were sold in those two days?

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Video Transcript

A shop sold 790 books on Wednesday and 205 books on Thursday. How many books were sold in those two days?

We know the shop sold 790 books on Wednesday and 205 books on Thursday. We have to work out how many books were sold altogether in those two days. We can do this by adding together 790 and 205. We could do this using column addition. Starting in the ones, we need to add zero and five. Zero and five makes five. In the tens column, we need to add nine and zero which gives us a total of nine. And in the hundreds column, we have seven plus two which is also nine. 790 plus 205 is 995.

An even quicker way to add these two numbers would be to use a number line or to count forwards. If we partition 205 into 200 and five, then we can add each part. Let’s add 200 first. 790 plus 200 is 990. Now, we just need to add the five. 990 and five more is 995. A shop sold 790 books on Wednesday and 205 books on Thursday. They sold 995 books in those two days.

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