3 years ago

Break apart the addends to find the sum 18+21

1 answer:

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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