There are addition horizontal (1 digit + 2 digit) worksheets. You can download and print all of them for free. Every worksheets include answers. (You can get other worksheets on Math Worksheets) for free.
Click image(pdf) link below and then you can download it.
addition_1digit_2digit_No1
addition_1digit_2digit_No2
addition_1digit_2digit_No3
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addition_1digit_2digit_No4
addition_1digit_2digit_No5
addition_1digit_2digit_No6
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addition_1digit_2digit_No7
addition_1digit_2digit_No8
addition_1digit_2digit_No9
addition_1digit_2digit_No10