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AnimeBrainly
4/10 = 40/100

40/100 + 55/100 = 95/100

95/100 is your answer

simplest form: 19/20

hope this helps
Since this is addition, find the least common denominator then you will just add the numerators

4/10 + 55/100
4/10 + 11/20
multiply the first fraction by 2
4*2/10*2 + 11/20
8/20 + 11/20
add the numerators 
19/20
Decimal form is 0.95

Hope this helps :)