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To find the sum of 4/9 and 7/12,Mario rewrites the fraction as 8/36 and 21/36 .His answer is 29/36. Is Mario right ? If not ,show his error and correct it.

Respuesta :

The answer is actually 37/36, or 1 1/36. The error was that when Mario multiplied 9 by 4, he only added the 4 to 4 instead of multiplying 4 by 4.