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b)6 4/9+8/9= 66/9=7 1/3
b)6 4/9+2 2/3:3= 6 4/9+8/3*1/3=6 4/9+8/9=7 3/9=7⅓
6 4/9+ 2 2/3:3= 6 4/9 + 2 2/9=8 6/9 = 8 2/3