reduced= 1 whole number and 1 over 9
improper=10 over 9
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2/3 + 8/9 = 6/9 + 8/9 = 14/9 or 1 and 5/9.
2/3 = 6/9 2/9 + 6/9 = 8/9
9/8 or 1 and 1/8
The sum of 2/9 and 2/3 is 8/9
9/16 + 2/8 9/16=9/16 2/8=4/16 9+4=13 so......13/16 is the answer!