order from least to the greatest 3/10,4/5,18,20,1/20,7/10

are you sure that there is an 18 and 20 because i think that there should be only fractions.

Convert all to 20ths and then order.

To order the given numbers from least to greatest, we need to compare and arrange them based on their numerical values. Let's begin by converting any fractions to decimal form, if possible:

3/10 = 0.3 (since when you divide 3 by 10, you get 0.3)
4/5 = 0.8 (since when you divide 4 by 5, you get 0.8)
1/20 = 0.05 (since when you divide 1 by 20, you get 0.05)
18, 20, 0.3, 0.8, 0.05, 7/10

Now let's list these numbers in ascending order:

0.05, 0.3, 0.8, 7/10, 18, 20

Therefore, when ordering the given numbers from least to greatest, the correct sequence would be: 0.05, 0.3, 0.8, 0.7, 18, 20.