# Question Video: Simple Adding: Column Addition with Three-Digit Numbers Mathematics • Second Year of Primary School

Add 40 to 251. Use the place value blocks if you need to.

01:29

### Video Transcript

Add 40 to 251. Use the place value blocks if you need to.

In this question, we need to use column addition to add 251 and 40. Did you notice that we’ve written the largest number first, 251? When we’re adding using column addition, we need to start in the ones column. The number 251 has one one, and the number 40 has no ones. One plus zero gives us a total of one. Next, we need to move to the tens column. 251 has five tens, and 40 has four tens. What is five plus four? It’s nine. Finally, we just need to add in the hundreds place. There are two hundreds in the number 251, but the number 40 has no hundreds, so there’s nothing to add to our two hundreds. The total is two. 251 plus 40 gives us a total of 291. First, we added the ones, then the tens, then the hundreds. 251 plus 40 is 291.

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