Aligning numbers vertically: Align the numbers vertically by their decimal places for addition.63.284+27.000
Adding the numbers: Add the numbers starting from the rightmost digit, which is the smallest place value.3 (from the hundredths place) +0=38 (from the tenths place) +0=84 (from the ones place) +7=11, write down 1 and carry over 1 to the next column.6 (from the tens place) +2+1 (carried over) +0=30
Writing down the sum: Since there are no more digits to add in the hundreds place and beyond, write down the remaining digits.The sum is 90.284.