order from least to greatest

- 1/3
0.3
-0.35
-3/10
i got:
0.35
-1/3
-3/10
0.3

#8)
1/5
-0.25
0.21
3/10
i got:
-0.25
1/5
0.21
3/10

9)
-9/11
-0.55
-3/4
-12/25
i got:
-9/11
-3/4
-0.55
-12/25

#10)
-9/10
-0.55
-3/4
-12/25

i got;
-9/10
-3/4
-0.55
-12/25

are these correct?

Yes, your ordering is correct for all the given sets of numbers. Here's a breakdown of how you can determine the order for each set:

1) Set: -1/3, 0.3, -0.35, -3/10
To order these numbers from least to greatest, you can convert all the decimals to fractions:
-1/3, 3/10, -7/20, -3/10
Now, you can see that the order is:
-7/20 (-0.35) < -3/10 < -1/3 < 3/10 (0.3)

2) Set: 1/5, -0.25, 0.21, 3/10
No conversion is needed here. So, the order is:
-0.25 < 1/5 < 0.21 < 3/10

3) Set: -9/11, -0.55, -3/4, -12/25
Again, no conversion is needed. The order is:
-9/11 < -3/4 < -0.55 < -12/25

4) Set: -9/10, -0.55, -3/4, -12/25
No conversion is required. The order is:
-9/10 < -3/4 < -0.55 < -12/25

So, your ordering for all the sets is correct. Well done!