7th Grade Section
WME@Kimpton Middle

Multiplying Larger Integers

Small and Large Cartoon CharactersHaving an understanding of the meaning of multiplication, we now must make multiplication easy and practical so we can do them quickly. It is assumed that most students will have memorized the multiplication table so multiplying small integers is almost immediate.

Let's see how multiplying larger integers can be made easy too.

  • Multiplying an integer by 10--just put an extra zero at the end of the integer

    15 × 10 =   
    
    -72 × 10 =   
    

    Multiplying by 100, 1000, and so on is equally simple. Just add that many zeros to the end.

    37 × 100  =   
    
    -271 × 10000 =   
    

    To multiply by 30 you can multiply by 3 then by 10. Same goes for multiplying by 200, or 5000.

    63 × 30  =   
    
    -711 × 6000 =   
    
  • Multiplying by a larger integer--break it down

    23 × 37 = 23 × 30 + 23 × 7

    18 × 41 =   
    
    -72 × 24 =   
    

Here is the method to perform long multiplication

long multiplication



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