chapter 7 adding mixed numbers 250

12 susie ran for 1 3/4 h. and then walked for 2 1/4 h. for how long did she travel ?

1 3/4+2 1/4 =
deal with fractions
3/4+1/4=4/4 0r 1
deal with whole number
1+2+1=4
she traveled for four hours