Answer:
You think about adding 9.8+2.6 in your mind and 9.8+2.6=12.4
Explanation:
Hope this helps.
First I would add 6 and 8 which gives me 14
Then I will add 9 and 2 which gives me 11
I will add the 1 from 14 to 11 which gives me 12
and I combine both numbers to get 12.4 accordingly
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