Ihave 4 digits. my 7 is worth 7*1000. my 2 is worth 200. one of my 4s is worth is worth 40. the other is worth 1/10 as much. what number am i ? can u with this question my son does not under stand this.

tell him to divide what the worths are it will -by-step explanation:

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right

a is the right answer