12 + 9 =21 12 + 9 =21
+ / \ + / \
8+1 4 + 5
12 + 8 = 20 12 + 4 = 16
20 + 1 =21 16 + 5 = 12
Here I split the 9 into 8 and 1. Here I split the 9 into 4 and 5.
Then I added 12 and 8 to make 20. I then added the 4 and 12
20 plus 1 = 21 . together to make 16 then
added the 5 and it made 21.
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