Multiplication with trailing zeros: Problem type 1

Trailing zeros

The zeros at the end of a number are known as trailing zeros.

For example

• The number of trailing zeros in 80 is one.
• The number of trailing zeros in 6000 is three.
• The number of trailing zeros in 100890 is just one.

Multiplication of numbers involving trailing zeros

Some Examples: Multiply 50 × 3; Multiply 200 × 6; Multiply 9 × 10,000

Multiply 70 × 6

Solution

Step 1:

Here we multiply 7 × 6 first

7 × 6 = 42

70 × 6 = 42__

Step 2:

Then we write a 0 at the end.

70 × 6 = 420

Multiply 600 × 4

Solution

Step 1:

Here we multiply 6 × 4 first

6 × 4 = 42

600 × 4 = 24__

Step 2:

Then we write two zeros at the end.

600 × 4 = 2400