1. Multiplying Decimals by Decimals
15.46 X 3.6

2. Set up the problem vertically
Set up the problem vertically. Then multiply as if the factors were whole numbers.
15.46
X 3.6
9276
46380
55656
Key Component
How many decimal
places are in the
first factor? 2
How many decimal
places are in the
second factor? 1
2 + 1 = 3

3. Start on the right and count over three places and insert the decimal point.
15.46
X 3.6
9276
46380
55.656 2 + 1 = 3

4. Let’s try a few. You put the decimal point in the answer.
0.9 X 0.3 = 027
0.2 X 0.4 = 008
1.7 X 0.6 = 102
2.46 X 0.8 = 1968

5. How did you do?
0.9 X 0.3 = 0.27
0.2 X 0.4 = 0.08
1.7 X 0.6 = 1.02
2.46 X 0.8 = 1.968

6. Your Turn!
Complete the worksheet.