Multiplication by 10, 100, and 1000

When we multiply whole numbers by 10, 100, 1000, we simply rewrite the numbers and put some extra zeros at the end.

Rules for the multiplication by 10, 100 and 1000.

• If we multiply a whole number by a 10, then we write one zero at the end.

• If we multiply a whole number by a 100, then we write two zeros at the end.

• If we multiply a whole number by a 1000, then we write three zeros at the end.

Multiply 47 × 10

Solution

Step 1:

Here we multiply 47 by 10, so rewrite 47 as

47 × 10 = 47_

Step 2:

Then we write a zero at the end

47 × 10 = 470

Multiply 63 × 100

Solution

Step 1:

Here we multiply 63 by 100, so rewrite 63 as

63 × 100 = 63__

Step 2:

Then we write two zeros at the end

63 × 100 = 6300

Multiply 121 × 1000

Solution

Step 1:

Here we multiply 121 by 1000, so rewrite 121 as

121 × 1000 = 121___

Step 2:

Then we write three zeros at the end

121 × 1000 = 121000