49-9=40 first take away the nine then you have 40 do the same with 21 so now 20
40+20=60 then you plus the 40 and the 20 together
9+1=10 then you plus the 9 and 1 that you took off and that is 10
60+10=70 then plus the 10 and the 60 together and that is 70
your answer is 70
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