1 2/3= 1 8/12 3 1/4= 3 ?/12

For our first fraction, we need to figure out how we can convert 1/4 into having a denominator of 12. Since 4 multiplied by 3 is 12, we will also have to multiply the numerator of 1 by 3:

1 x 3 = 3

So, the fraction should be:

3 [tex]\frac{3}{12}[/tex]

Our numerator is 3.

Part 2:

The second part of this question is asking us to add both mixed numbers 1 [tex]\frac{2}{3}[/tex] and 3 [tex]\frac{1}{4}[/tex] together. We cannot add them together since they don't have common denominators. However, we have converted them to both have a denominator of 12, so we can add those together:

1 [tex]\frac{8}{12}[/tex] + 3 [tex]\frac{3}{12}[/tex] = 4 [tex]\frac{11}{12}[/tex]

Our numerator for the third fraction is 11.

Final answers: 3, 11

Learn more about adding fractions here: https://brainly.com/question/30393045?referrer=searchResults

Hope this helps!