John says that when you add 7 2/3 to 2 2/3 you must add the whole numbers together first ( 7+2=9) then you just add the numerator together (2+2=4)and you add the denominators unfortunately John stratagy is in correct and then briefly explain the flaw in John reasoning
1 answer
John's strategy is incorrect because when adding mixed numbers, you must first add the whole numbers together and then add the fractions separately. So, for this problem, 7 2/3 + 2 2/3, you should add the whole numbers (7+2=9) and then add the fractions (2/3 + 2/3 = 4/3). The correct sum should be 9 4/3, not 9 4/6 as John's strategy would suggest.