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MENTAL MATH: TiPs & TrIcKs for...

 
     

Addition II

Break the second number in a way that it fits with the first number. For example, 7 + 4 = 11

 


(fig 5)

Blocks like these helped me a lot when I was younger! Once you get the hang of it you have no idea of how much it helps.

And it works just as well for larger numbers. For example: 23 + 16 = 39. Do the operation is steps, first add the 3 and the 6 on one side, and add the 20 and the 10 on the other. Then add both results.

 
 


3 + 6 = 9

20 + 10 = 30

---------------------------------

30 + 9 = 39

 

     
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