Which on is greater?

342 hundredths plus 7 tenths
or

3 plus 49 hundredths

342 hundredths + 7 tenths 
= 3.24 + 0.7
= 3.94

3 + 49 hundredths
= 3 + 0.49
=3.49

Therefore 342 hundredths + 7 tenths is greater than 3 + 49 hundredths.

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm