If I weigh 250 lbs on earth, how much do I weigh on the moon? One of my homework questions is to determine how much a 250 lb person weighs on the moon.  I first googled a calculator for this and found that the weight is 41.5 lbs.  So I tried to derive it myself and I cannot seem to get the correct answer.
Here is what I'm doing:
$$F=ma$$
I first converted $250$ lbs to Newtons:
$$250lb\frac{4.448 N}{1 lb}=1112N$$
So I then figured I'd plug values into the the formula $F=ma$
$$1112N=113.5kg(1.6\frac{m}{s^2})$$
But no matter how I solve this, I cannot seem to get the correct answer.  What am I doing wrong?

You just need to find the weight force the person creates when on the moon and then multiply the mass of the person by the ratio of $F_{moon}$ to $F_{earth}$
