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The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7
It is: 37/100 plus 5/10 = 87/100
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When adding 3 tenths and 4 tenths, you are essentially adding like terms. In this case, both numbers have the same unit (tenths), so you can simply add the numerical values together. Adding 3 tenths and 4 tenths gives you a total of 7 tenths.
The sum of 15 and -7 is 8.