180/60=
420/30=
420/70=
1800/3=k
k=?
2000/400=z
z=?
2400/300=s
s=?
A group of 10 people bought tickets to a reptile exhibit and paid $130. What is the price of 1 ticket?
A video store took in $450 in DVD rentals during one day. If DVDS rent for $9 each, how many DVDs were rented?

What is Sonia's mistake?
How can patterns help me divide multiples of 10?