Multiplying Decimals

Vocabulary Product –the answer to multiplying two or more numbers.

0.7 x 0.4 To model multiplication: Go across the top Then, go down Area that overlaps represents the answer

0.7 x 0.4

0.7 x 0.4

0.7 x 0.4

0.2 x 0.6

0.2 x 0.6

0.2 x 0.6

Try This… Sample Problem #1

What to do? Step 1: Line up the numbers as if there were no decimals Step 1b: DO NOT add ‘0’ as place holders

What to do? Step 2: multiply as if you had whole numbers

What to do? Step 3: count the number of decimal places in each number

What to do? Sample Problem #2: Step 4: the total will be how many decimal places are in your answer

Example 2 Decimal places + 1 Decimal place 3 Decimal places

Practice 0.8 x 2

Practice 5.06 x 7

Practice 1.7 x 2.3

Practice 2.38 x 0.4

Practice Charlie hikes for 1.25 hours at an average speed of 2.6 miles per hour. How many miles does Charlie hike?