The sum of 7.90 and 60 is 67.90. To add these two numbers, you align the decimal points and add the digits in each place value column, starting from the right. In this case, 0 + 0 in the tenths place equals 0, 9 + 6 in the ones place equals 15 (write down 5, carry over 1), 7 + 0 in the tens place equals 7, and finally add the carried over 1 to get the final sum of 67.90.
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