Question

What is 1/10 + 8/100

Answer 1

the answer is 9/50 .
first find the common denominator which will be 100 . 
so you multiply 10 to the numerator ans the denominator of 1/10 to get 10/100
now you have to add 8/100+10/100= 18/100
you're not done yet because now you have to simplify your answer.
all you have to do is divide both by 2
to get 18/2=9 and 100/2=50 
so your answer is 9/50

Answer 2

to add two fractions you have to make the fractions a one denominator. 
in this question you can multiply the denominator and numerator of 1/10 by 10 to match the denominators,

1×10/10×10 + 8/100
=10/100+8/100
=18/100
=9/50

answer=9/50
hope this helps.....