Put three fourths -7/10 -3/4 8/10 in least to greatest

-3/4, -7/10, 3/4, 8/10

These are in least to greatest.

Alright! 
Three Fourths is 3/4. 

So our numbers are...

3/4, -7/10, -3/4, 8/10

We'll need a common denominator to compare the fractions. A common denominator is simply a number which they are all divided by. 

So! The one that jumps out the most is 40, because it is the lowest number that both 10 and 4 are divisible by. 
In order to get a common denominator you must multiply it by that multiple.

3/4 * 10/10 = 30/40

-7/10 * 4/4 = -28/40

-3/4 * 10/10 = -30/40

8/10 * 4/4 = 32/40

Larger negative answers are smaller. Think of it in terms of a number line. As you go to the left the negative numbers get bigger and bigger, and thus smaller and smaller. 

Least to greatest would look like this: 

-30/40, -28/40, 30/40, 32/40