fer5 fer5
  • 11-12-2015
  • Mathematics
contestada

break apart the addends to find the sum 18+21

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WorldCitizen WorldCitizen
  • 11-12-2015
we break apart the first numer:

10+8

the second:

20+1

and add like this:

18+21=10+8    +  20+1

now, we can mix up the order:

18+21=10+8    +  20+1= 10+20     + 8+1

add the parts:

18+21=10+8    +  20+1= 10+20     + 8+1=30+9=39




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