Question

If each pretzels weighed a half an ounce, how many pretzels would fit in a 16 ounce bag

Answer 1

32 pretzels because since each pretzel wieghs 1/2 an ounce you multiply 16x 2=32

Answer 2

To find out we should, divide the whole weight to weight of each pretzels.

The whole is 16 ounce and each pretzel is $\frac { 1 }{ 2 }$ ounces. So let's divide :

$\frac { 16 }{ \frac { 1 }{ 2 } } \\ \\ We\quad can\quad rewrite\quad \\ this\quad expression\quad as\quad :\\ 16\cdot \frac { 2 }{ 1 } \\ and\quad that\quad is\quad equal\quad to\\ 16\cdot 2=32$

When you divide a number by a fraction, you can flip the fraction upside down and multiply it with the number, the result will be same.