To multiply numbers having zeros at the end: ex. 6000×1200

-Ignoring the ending zeros multiply together the rest of the digits. This yields the first part of the answer. ex. 6×12=72_ _ _ _ _

-Count the ending zeros in the numbers being multiplied, and place that many at the end of the answer. ex. _ _ 00000

Simple: 400×600=240000 222,200×30,000=6666000000

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