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My solution:

I made the 8 in 0.87 into 8/10

And since its in tenths 10 would be its denominator.

I did he same thing to the 7, and since its in hundreths it will be 7/100

We just need to add 8/10 to 7/100

I'm sure you already know how to add fractions so the answer will be 87/100

I forgot about the 1/2 so you just always ad it to 87/100 so the answer will be 137/100.

To simplify it just divide 100 to 137.

The answer will be 1.37.

You will make the 1 as a whole number and the 37 into numerator.

Your denominator will 100 so the answer is 1 37/100