Thinking Mathematically (6th Edition)

$1~g = 10 ~dg$ $1~g = 1000~mg$ $1~dg = 100~mg$ To convert from units of $dg$ to units of $mg$, we need to move the decimal point 2 places to the right. $12.4 ~dg = 12.40 ~dg = 1240 ~mg$