# Operations with decimal rational numbers

1,28 + 2,6 + 0,038

Transforming into decimal fractions we have:

Practical method:

 1º) We equate the number of decimal places, with the addition of zeros;2º) We put comma under comma;3º) We made the addition, placing the comma in the sum aligned with the others.

Examples:

 1,28 + 2,6 + 0,038 35,4 + 0,75 + 47 6,14 + 1,8 + 0,007

## Subtraction

Consider the following subtraction:

3,97 - 2,013

Transforming into decimal fractions we have:

Practical method:

 1º) We equate the number of decimal places, with the addition of zeros;2º) We put comma under comma;3º) We performed the subtraction, placing the comma in the difference, aligned with the others.

Examples:

 3,97 - 2,013 17,2 - 5,146 9 - 0,987
Next: Multiplication