Question

Please tell me the answer! I'm crying in confusion! :(

Answer 1

Find the common denominator:

3 6 9
-- -- --
7 14 21

1 2 3 4 5 6 7 8
-- -- -- -- -- -- -- --- ---
3 6 9 12 15 18 21

Ok, so we know the common demonators are 9/21 and 8/21

Now we subtract 9/21 and 8/21 which is 1/21

So.. There is 1/21 pizza left!

Hope this helped :))

Answer 2

First, change the fractions to a common denominator, which is 21.

so 3/7 * 3/3 = 9/21

1/3 * 7/7 = 7/21

Add the two together

9/21 + 7/21 = 16/21

Then take 21/21 - 16/21 = 5/21

There is 5/21 of the pizza left.