Add the decimals: align the decimal points.<br><br>&bull; 8.54 + 7.89<br>&bull; 4 + 9 = 13 hundredths: write 3, carry 1 to tenths<br>&bull; 5 + 8 + 1(carry) = 14 tenths: write 4, carry 1 to ones<br>&bull; 8 + 7 + 1(carry) = 16 ones<br>&bull; 8.54 + 7.89 = 16.43<br><br>Final Answer: 16.43