# Evaluate 1.2*15.5 1.2⋅15.5
Multiply using long multiplication.
Multiply 5 by 2. Place the ones digit (0) in the result line and carry the tens digit (1). There is one result line for each digit in 15.5.
 1 1 .2 ⨯ 1 5 .5 0
Multiply 5 by 1 and add the carried 1. Place the result in the next column in the result line. There is one result line for each digit in 15.5.
 1 .2 ⨯ 1 5 .5 6 0
Multiply 5 by 2. Place the ones digit (0) in the result line and carry the tens digit (1). There is one result line for each digit in 15.5.
 1 1 .2 ⨯ 1 5 .5 6 0 0
Multiply 5 by 1 and add the carried 1. Place the result in the next column in the result line. There is one result line for each digit in 15.5.
 1 .2 ⨯ 1 5 .5 6 0 6 0
Multiply 1 by 2. Place the result in the next column in the result line. There is one result line for each digit in 15.5.
 1 .2 ⨯ 1 5 .5 6 0 6 0 2
Multiply 1 by 1. Place the result in the next column in the result line. There is one result line for each digit in 15.5.
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2
Add the numbers in each column. In this case, add 0+0+0, then place the 0 in the result line.
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2 0
Add the numbers in each column. In this case, add 6+0+0, then place the 6 in the result line.
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2 6 0
Add the numbers in each column. In this case, add 0+6+2, then place the 8 in the result line.
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2 8 6 0
Add the numbers in each column. In this case, add 0+0+1, then place the 1 in the result line.
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2 1 8 6 0
 1 .2 ⨯ 1 5 .5 6 0 6 0 1 2 1 8 6 0
To find the number of decimal places needed in the answer, add the number of decimal places in the multiplier and multiplicand. In this case, there is a total of 2, so the answer must have 2 decimal places as well.
18.6
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