There are 12 in one dozen. Therefore, 3.5 dozen rolls is equal to 3.5 x 12 = 42 rolls.
Unless of course, it's a baker's dozen!
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Do you know that a 'dozen ' is 12 . -One fourth of 12 is 3, therefore, 3/4 equals 9.
Half a dozen is 6 which is 3 times 2.
There are 42 eggs in three and a half dozen. To calculate this, you first determine how many eggs are in one dozen, which is 12. Then you multiply 12 by 3 to get the total number of eggs in three dozen, which is 36. Finally, you add half of a dozen, which is 6, to get a total of 42 eggs in three and a half dozen.
dozen = 12 half doz. = 6 12 x 3 + 6 = 42
42 = 12 + 12 + 12 + 6