Addition of rational numbers

Carry out the following additions of rational numbers. 5/36+6/42

Carry out the following additions of rational numbers. 11/17+13/19

Carry out the following additions of rational numbers. 1 2/3+2 4/5

Carry out the following additions of rational numbers. 2 3/11+1 3/77

............. is the identify for the addition of rational number-

Which of the following is an example of distributive property of multiplication over addition for rational numbers.