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.
