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MENTAL MATH: TiPs & TrIcKs for...

Multiplication II

Multiplying numbers from 11 and over is quite easy, it's just a mater of, yet again, playing with numbers.

 

 
     

Say you want to solve 6 x 13 = (78) All you have to do is solve 6 x 10 first, which is 60, and then solve 6 x 3, which is 18... add it up and there's your answer!

What if you have  8 x 24 (= 192). Multiply 8 times  2 =160; then multiply 8 times 4 =32; finally, add 160 + 32 = 192.

 
 

 

REMEMBER that when multiplying a large number times 5, its always easier to multiply times 10 and then divide by 2.

 

     
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