The Singing Hedgehog Guide to:

Decimal Multiplication 2

Decimal Multiplication 2

Let's try one with long multiplication.

4.56 x 1.7

We are still doing a horizontal process so we:

DO NOT LINE UP THE DECIMAL POINTS!

We MUST NOT put in extra zeroes. Here is an example:

We start by ignoring the decimal points and just do 456 x 17

If you can't remember how to do this go to here

Now we must look at the question to see what we did to it.

To change 456 into 4.56 we move the decimal place two times

(or divide by 100)

To change 17 into 1.7 we move the decimal place once

(or divide by 10)

We have moved the decimal point THREE times in the question,

so we move the decimal point THREE times in the answer.

The answer is then 7.752

4.56 x 1.7

We are still doing a horizontal process so we:

DO NOT LINE UP THE DECIMAL POINTS!

We MUST NOT put in extra zeroes. Here is an example:

We start by ignoring the decimal points and just do 456 x 17

If you can't remember how to do this go to here

Now we must look at the question to see what we did to it.

To change 456 into 4.56 we move the decimal place two times

(or divide by 100)

To change 17 into 1.7 we move the decimal place once

(or divide by 10)

We have moved the decimal point THREE times in the question,

so we move the decimal point THREE times in the answer.

The answer is then 7.752