Addition of Decimals

Step I: Write the numbers vertically aligning on the decimal points.

Add the tenths.

4 + 6 + 2 = 12

Place 2 in the tenths column and place the point before it. Carry 1 to the whole number part.

Add the whole numbers.

3 + 4 + 5 + 1 = 13

The sum of 3.4, 4.6 and 5.2 is 13.2

The required sum is 13.2

Step I:

Write the numbers vertically aligning on the decimal points.

Write equivalent decimals of 5 and 3.8 up to three places.

5 = 5.000                      3.8 = 3.800

Add thousandths

9 + 0 + 0 = 9. Write 9 under thousandths

Add hundredths

3 + 0 + 0 = 3. Write 3 under hundredths

 Add tenths

5 + 0 + 8 = 13. Write 3 under tenths and carry 1 to ones place.

Add ones.

4 + 5 + 3 + 1 = 13. Write 3 under ones and carry 1 to tens place.

 Add tens.

1 + 1 = 2. Write 2 under tens.

The required sum is 23.339

                4 6 . 2 5

              1 0 8 . 4 5

          +  4 5 6 . 6 2

              6 1 1 . 3 2

While adding we ensure that the decimal point of all the numbers should be in the same column.

       2 3 0 . 4 5

       1 8 9 . 5 6 8

     +   2 5 . 7 0 9

        4 4 5 . 7 2 7

Or,

       2 3 0 . 4 5 0

       1 8 9 . 5 6 8

    + 0 2 5 . 7 0 9

       4 4 5 . 7 2 7