Line up the units, tens and hundreds of the numbers carefully.

Use the column addition to add these numbers.

Use the column addition to add these numbers.

The number which is 1213 more should be bigger than 2345.

Altogether simply means to add.

Use the column addition to add these numbers.

We will add the units digit of all the numbers to get the units digit of the sum.

Use the column addition to add these numbers.