A megagram is a unit of mass. A meter is a unit of distance. Since one of those does not convert to the other, the decimal point would not appear to move at all.
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The decimal point moves to the right.
When going from larger to smaller units, there will be more of them. That indicates multiplication, which will make the decimal point appear to move to the right.
it is multiply by 100 so 2 moves to the right
It can move in either direction.
Decimal move to the left by 12 steps.