I never heard of "compatible numbers".
Just add them, keep the decimal point in the same place, and you get $8.10
the answer is 8.10 you get this because if yo add.05+.05 it would =.10 so you carry the 1 to the tenths place and then add .70+.30 and then add .10 because that is the answer for the hunthenths place and then it would be.10. Then you add 2+5 then add .10 and you wouled get 8.10
Compatible numbers are numbers that are easy to compute mentally
tell what compatible numbers you would use.then add
What is your question Anonymous? What it looks like is that you rounded. 300+100 = 400 is correct.
Compatible 67+ 119
Tell what compatible numbers you would use then add 419+263
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