Is -3.606 a rational number

Answer 1

YES because it can be converted into a ratio/fraction

-3.606 = -3 606/1000

Cancel the fraction down

-3 303/500

NB By a 'rule of thumb' , Irrational Numbers are those were the decimals go to infinity AND there is no regular numerical order in the decimal digits.

e.g.

pi = 3.141592.... is IRRATIONAL ; irregular order in the decimal digits.

but

1/3 = 0.33333.... is Rational

-0.363636.... is Rational

because the decimal digits are in a regular order.

Answer 2

-3.606 = -3606/1000 so by the definition of rational numbers, it's rational.