Multiplication of two numbers is easy, right? At primary school we learn how to do long multiplication like this: Methods similar to this go back thousands of years, at least to the ancient Sumerians ...

(upbeat music) - [Kids] Math Mights! - Welcome, third grade Math Might friends. I'm so excited that you joined us today. My name is Ms. Askew and I can't wait to have fun with you learning about math.

To multiply decimals by 10, 100, and 1000, use place value labels. Write the digits of the decimal using place value labels. Start with the first non-zero digit. To multiply by 10 move each digit one ...