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Question Video: Adding Three Two-Digit Numbers Using Column Addition Mathematics • 3rd Grade

Find the result of the following: 64 + 23 + 72

01:39

Video Transcript

Find the result of the following: 64 plus 23 plus 72.

In this question, we have to add together three two-digit numbers, and we have to use the standard written method. It doesn’t matter how many numbers we’re adding together using the written method. We always start by adding the digits in the ones column. 64 has four ones, 23 has three ones, and 72 has two ones. So, we need to add four and three and two. We know that four plus three is seven and two more makes nine. Next, we need to add in the tens column. 64 has six 10s, 23 has two 10s, and 72 has seven 10s. So, we need to add together six 10s plus two 10s plus seven 10s.

It doesn’t matter which order we add these three digits. We could add six and seven to give us a total of 13 10s and then add two more 10s. We know that 13 plus two is 15. Six 10s plus two 10s plus seven 10s is 150 or 15 10s. We found the result using the standard written method. 64 plus 23 plus 72 equals 159.

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