19/21.
4/7 + 3/9 = 36/63 + 21/63 = 57/63 = 19/21.
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4/9ths is bigger than 3/7ths because a common denominator is 63. 4/9ths=28/63rds and 3/7ths=27/63rds. 28/63rds is slightly bigger than 27/63rds so that means that 4/9ths is slightly larger than 3/7ths.
4/7ths plus 4/7ths equals 8/7ths. This would be 1 and 1/7th
3 4/9 x 4 = 13.7 recurring (that is, 13.7777...) or 13 7/9.
3 divided by 1 and 5/7 is 7/4 or 1 and 3/4 as a mixed number
0.4444444444 . . .