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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