Multi-digit Multiplication

Objective: Solve problems using whole number multi-digit multiplication (0406.2.11).

3 26 5 4

x

First, multiply the digits in the ones place of both factors.

8

3 26 5 4

x

Next, multiply the digits in the tens place of the top factor by the ones place in the bottom factor.

80

Don’t forget the adding attic!

1

3 26 5 4

x

Then, multiply the digit in the hundreds place of the top factor by the ones place of the bottom factor.

80

Don’t forget the numbers in the adding attic!

1

13

3 26 5 4

x

Always add a zero below the first product as a space saver.

80

1

130

3 26 5 4

x

Now, multiply the digit in the ones place of the top factor by the digit in the tens place of the bottom factor.

80

Carry into the adding attic!

1

1302

1

3 26 5 4

x

Then, multiply the digit in the tens place of the top factor by the digit in the tens place of the bottom factor.

80

Don’t forget the numbers in the adding attic!

1

1302

1

6

Carry into the adding attic!

1

3 26 5 4

x

Next, multiply the digit in the hundreds place of the top factor by the digit in the tens place of the bottom factor.

80

Don’t forget the numbers in the adding attic!

1

1302

1

6

1

19

3 26 5 4

x

Finally, add the two products together to get the final product.

80

1

1302

1

6

1

19+82,90

1

2