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WorldlyGlass49
Since 1 gram has 1000 miligrams, that would mean that Ezra's stuffed animal has a mass of 300 000 miligrams. 
Willchemistry
1 g ----------- 1000 mg
300 g ------- ( milligrams )

miligrams = 300 x 1000 / 1

miligrams = 300000 / 1

= 300000 mg

hope this helps!

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