Multi-digit addition

​Adding two-digit numbers with regrouping

​Sometimes, you will need to regroup. Let's try it with 15+37!
First, write the numbers with the place values lined up.

​Now, add the digits in the ones place. Since 5+7=12, you need to regroup. Regroup 12 ones as 1 ten and 2 ones. Write 1 in the tens column and 2 in the ones column, below.

​Then, add the digits in the tens place. Don't forget to add the regrouped ten!

​So, 15+37=52!

​Adding larger numbers

​Follow the same steps to add larger numbers. Let's try it with 252+356.
First, write the numbers with the place values lined up.

​Now, add the digits in the ones place.

​Then, add the digits in the tens place. Since 5+5=10, you need to regroup. Regroup 10 tens as 1 hundred and 0 tens. Write 1 in the hundreds column and 0 in the tens column, below.

​Last, add the digits in the hundreds place. Don't forget to add the regrouped hundred!

​So, 252+356=608!

​Let's try it with even bigger numbers! Add 10,374+24,832.
First, write the numbers with the place values lined up.

​Now, add the digits in the ones place.

T​hen, add the digits in the tens place. You will need to regroup!

​Next, add the digits in the hundreds place. Don't forget to add the regrouped hundred. You will need to regroup again!

​Now, add the digits in the thousands place. Don't forget to add the regrouped thousand!

​Last, add the digits in the ten-thousands place.

​So, 10,374+24,832=35,206!