1 1/4 3 1/2. additon

19/4

Step-by-step explanation:

First convert 1 1/4 into a improper fraction:

5/4

Then convert 3 1/2 into a improper fraction:

7/2

Now find the LCM of both denominators:

4

Now multiply the fractions such that the denominators are equal to 4:

5/4 x 1/1 = 5/4

7/2 x 2/2 = 14/4

Now add the numerators:

5 + 14 = 19

Now put the numerator and denominator together to get:

19/4

4 3/4

Step-by-step explanation:

1 1/4 + 3 1/2 =

5/4 + 7/2=

5/4 + 14/4=

19/4 = 4 3/4