Video: Using Place Value Blocks to Add Three-Digit Numbers and Regroup Ones

Michael used place value blocks to show how to add 425 and 369. What is the sum?

02:21

Video Transcript

Michael used place value blocks to show how to add 425 and 369. What is the sum?

In our addition problem, in the ones place, we have five plus nine. Let’s look at the ones blocks to find out what Michael did. Michael realised that there were more than 10 ones blocks. So he counted up 10 of the ones blocks and moved them into the tens place instead. 10 ones were equal to one 10. We no longer need those 10 ones in the ones place because we’re using a block of 10 instead.

We now count the remaining ones blocks. There are four ones and so we write a four in the ones place. And then, we put an additional one in the tens place to represent the new tens block we’ve just created.

Now that we’ve finished adding up all the ones, we can move on to the tens place. Let’s count the number of tens blocks in the tens place. We have the one we carried over plus two plus six. Altogether there are nine 10 blocks. So we can write a nine in the tens place.

Our last step is to add the number of hundreds blocks we have. Four hundreds blocks plus three hundreds blocks equals a total of seven. Four plus three equals seven. By using value blocks we’ve added 425 plus 369 together to equal 794.

The sum is 794.

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