Is this true or false “ the number 0.4 can be written as 4/10 so is it a rational number

True.

Step-by-step explanation:

Any number that can be written as a fraction a/b where a and b are integers (neither a nor b= 0) is rational,

For example 3 ( = 3/1) , 1/3 , 5/10 are all rational.

TRUE!

Step-by-step explanation:

0.4 is pronounced four tenths thus it can be written as 4/10 so it is a rational number>