First separate the fractions where the top (numerator) is bigger than the bottom (denominator) because these will be greater than 1. So we have 6/3, 9/7 and 9/5. 6/3=2, while the other two are between 1 and 2. To find out which of the two is bigger, we can see that the numerator is 9 in each case, so we're left with deciding between 1/7 and 1/5. The bigger the denominator, the smaller the fraction, so 1/5 is bigger than 1/7 and that means 9/5 is bigger than 9/7. So from least to greatest in these three fractions we have 9/7, 9/5 and 2.
Now for the rest 2/5, 1/2, 3/8. Their lowest common denominator is 40 (2 goes into 8 so we only need to multiply 5 and 8 to get the LCD). 2/5=16/40 (5 into 40 goes 8 multiplied by 2 is 16), 1/2=20/40 and 3/8=15/40. Which is greatest, 16, 20, or 15? Least to greatest is 15, 16, 20 which is 3/8, 2/5, 1/2.
Now put it all together: 3/8, 2/5, 1/2, 9/7, 9/5, 6/3.