3/16 - 1/2

You want to make the denominators the same.
So what number do you multiply by 2 to get 16? That number is 8. So you multpily the numerator and denomiator of the (1/2) by 8
So you will have:

3/16 - (1*8)/(2*8) = 3/16 - 8/16

Now since denominators are the same, we can then easily add/subtract the numerators

(3-8)/16 = -5/16

If you have any question about this solution let me know.

1/2 = (1 * 8) / (2 * 8) = 8/16

3/16 - 1/2 = 3/16 - 8/16 = -5/16

If you're someone who wants to visualize and have a more intuitive understanding of this, imagine a large pizza cut into 16 slices, and you have 3 slices left. Suppose your friend calls you and says "hey, I'm super hungry, and I'm going to eat half a pizza", do you have enough pizza left for him? And if not, how much are you short?

Then out of a whole 16 slice pizza, half would be 8 slices. Since you only have 3 slices, you would be 5 slices short, so your friend should pick up more pizza before he comes over.

3/4*1/4 = 3/16

3/16 - 1/2 = -5/16