When you multiply a 3-digit number by a 1-digit number, the best way to do this without a calculator is to use short multiplication. This is how you would use short multiplication to find out the ...

Consider the following rule: Start with any two-digit number, then repeatedly multiply the digits together until the result is a one-digit number. For example: 84 ⇨ 32 ⇨ 6, or 97 ⇨ 63 ⇨ 18 ⇨ 8. What ...