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tatiyna
3 years ago
14

Break apart the addends to find the sum 18+21

Mathematics
1 answer:
ololo11 [35]3 years ago
3 0
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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