Math (kindergarten)
posted by Anonymous .
Break apart the addends. Solve for the total sum.
18
+ 21


10 + 8 + 20 + 1 =
or
20  2 + 20 + 1 
39

start on the right. 8+1=9 move to the left side. 1+2= 3. the solution to this problem is 39

go to the right.8+1=9
go to the left.1+2=3
it is 39. 
10+8+20+1= 39

39

18 + 21 = 39
Answer:
39
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