How to Multiply Decimal Numbers by 10s, 100s and 1000s (Powers of 10)?

Practice Unlimited Questions

Concepts Explained

1. Multiply by 10.

2. Multiply by 100

3. Multiply by 1000

1.  Find the product of 3.216 and 10.

   3.216  ×  10  =  32.16
When you multiply a decimal number by 10, its decimal point moves 1 place to the right.

Quick trick: Since there is 1 zero in 10, move the decimal point 1 place to the right.

2.  Find the product of 3.216 and 100.

   3.216  ×  100  =  321.6
When you multiply a decimal number by 100, its decimal point moves 2 places to the right.

Quick trick: Since there are 2 zeroes in 100, move the decimal point 2 places to the right.

3.  Find the product of 3.216 and 1000.

   3.216  ×  1000  =  3216.0  =  3216
When you multiply a decimal number by 1000, its decimal point moves 3 places to the right.

Quick trick: Since there are 3 zeroes in 1000, move the decimal point 3 places to the right.

4.  What is 3.216  ×  200?

   3.216  ×  200
=  3.216  ×  2  ×  100
=  6.432  ×  100
=  643.2
200  =  2  ×  100

3.216  ×  2  =  6.432