Question

keiko walks 5/10 kilometer from school to the park. Then she walks 19/100 kilometers fromt the park to her home. How far does Keiko walk?

Answer 1

69/100 kilometers 
you want to make the denominator for both numbers and to do that you would multiply 5/10 by 10 and you would get 50/100 and 50/100+19/100 which equals 69/100

Answer 2

50/100 + 19/100 = 69/100 kilometer