Is 21/32 greater than 3/4

No its not 21/32 is less than 3/4

Step-by-step explanation:

It's highly advisable to find and use the LCD in problems like this.

21/32 has the denominator 32; if we multiply numerator and denominator each of 3/4, we get the equivalent fraction 24/32.

Now, compare 21/32 and 24/32. It's pretty obvious that "21/32 greater than 3/4" is false; 24/32 is greater than 21/32, so 3/4 is greater than 21/32.