Which one is greater 1 4/5 or 21/12

Here is the answer 21/12

Step-by-step explanation:

to break 21/12 into a fraction we need to subtract, add a whole.

21-12 is 9 1 9/12

now we need to find a gcf for only 9/12 but divide

this is because the gcf of 4/5 is only 1 so we can't use it

the gcf for 9/12 is 3

9/12 divided by 3 is 3/4

to know what's greater I use the butterfly trick Which is sideways multiplying

3. 4

- -

4 5

3 x 5 is 15

4 times 4 is 16

below the 16 should be 4/5

and if you look all the way at the top, it started as 21/12

so it is 21/12