Ans.3)  Hello Gilbert, thanks for your question! Here's what I figured out, by the way I am a school student also,I am 44 years old too!! It's never to late!  Ok, my answer that I got is 150 million children . Here's how I figured it out,..........Macy's hired 400 santas, if each (1) santa sees 125 childern per day that would be as follows on paper ( 1x125= 125). With that known we will take 125 and times X it by 30, being 30 days for just 1 santa = 125x30= 3,750. Ok, ya with me so far?....We have 3,750 ( three thousand seven hundred fifty) children being seen by 1 santa for the entire 30 days. Stay with me man....it gets better!.....so therefore lets take that big figure of 3,750 ( children) and times (x) that by .............how many santas? ( 400 santas!!.....thats a lot of santas in one store?!!).......so ( 3,750 x 400= what..........=150,0000 ! ) Remember to also count from the last zero, starting from the very right and counting left, go tenths (0), hundreths (00) , thousanths,(000) , millionenths ,(0000).  Pardon my spelling it be incorrect but I'me pretty shure that my answer is correct, print it out & show your math teacher just to see if I am correct.  Later. Steve from Phily., Pa.