math
posted by zavier on .
please show work
19 and 6/7 +12 and 2/3

19 and 6/7 +12 and 2/3
When you add and subtract fractions, you must use the same common denominator.
Since 21 is evenly divided by both 7 and 3, 21 is the common denominator.
19 6/7 = 19 18/21
12 2/3 = 12 14/21
19 18/21 + 12 14/21 = 31 32/21 = 32 11/21