Reducing to lowest term doesn't work

[sang-gye]

Hello there,

this is the task:

Evaluate: (-1.5)(1.2) - (4.5)(0.4)/30

This is what I did:
(-1.5)(1.2)=-1.80
(4.5)(0.4)=1.80

-1.80-1.80=-360

thus:
-360/30 (divide nominator and denominator by 30) = 12/1 = -12

but, I know that the correct answer is: -0.12

and I get there by saying: 360/30 (divide by 3 instead of 30): -120/10 and I can convert that into decimals: -0.12

Why is it that I screw up?

Thanks
Sang-gye[/quote]

 

[TchrWill]

Evaluate: (-1.5)(1.2) - (4.5)(0.4)/30

This is what I did:

(-1.5)(1.2)=-1.80
(4.5)(0.4)=1.80
-1.80-1.80=-360

thus: -360/30 (divide nominator and denominator by 30) = 12/1 = -12

but, I know that the correct answer is: -0.12

If this is the problem
[(-1.5)(1.2) - (4.5)(0.4)]/30

(-1.5)(1.= -1.8
(4.5)(0.4) = 1.8
-1.8 - 1.8 = - 3.6
-3.60/30 = -0.12

 

[Denis]

-1.80-1.80=-360

-1.80 - 1.80 = -3.60
-3.60 / 30 = -.12