Multiplying Decimals

2.5 x 3 =

• 7.5

• 75

• 0.75

• 61.5

How do you know where to put the decimal?

• You count how many digits are to the right of the decimal in each number. Then you put the decimal that many spots to the left in the answer.

• You count how many digits are to the right of the decimal in the first number only. Then you put the decimal that many spots to the left in the answer.

• You count how many digits are to the right of the decimal in the second number. Then you put the decimal that many spots to the left in the answer.

• You count how many digits are to the right of the decimal in each number. Then you put the decimal that many spots to the right in the answer.

When you multiply 12.5 x 3.1, you put the decimal...

• 1 place to the left (387.5)

• 1 place to the right (3.875)

• 2 places to the left (38.75)

• 2 places to the right (38.75)

0.25 x 9 = (think of money - 0.25 is one quarter)

• 225

• 22.5

• 2.25

• 0.225

12 x 0.5 =

• 60

• 6

• 0.6

• 0.06

1234 x 0.1 =

• 1234

• 123.4

• 12.34

• 1.234

0.25 x 15 =

Which step is not correct for multiplying decimals?

• Count how many digits are to the right of each decimal point.

• Multiply the numbers regularly.

• Add a zero to your answer.

• Move the decimal point to the left, one spot for each digit that was to the right of the decimal in your question.

0.5 x 0.5 =

Multiplying decimals is...

• Easy!

• Fun!

• Awesome!

• Almost as great as cats but not quite...