7 tenths is bigger because if you made 2 fifths into tenths it would be 4 fifths as 10 is doule of 5
7/10 - 2/5 = 3/10 or three tenths
two fifths of seven tenths = 2/5 x 7/10 = 2x7/5x10 = 7/25
7
There are two fifths in four tenths.
22 tenths
4/7
7/10 - 2/5(4/10) = 3/10
10
3 fifths is larger. 4 tenths is 0.4 , 3 fifths is 0.6
3 and 1/2 of them
18