It take 9 stamps to mail a package. If Tyler has 150 stamps, how many packages can he mail?
How many stamps does Tyler have left over?
If he needs to mail out 17 packages, how many more stamps will he need?
150/9 = 16 2/3 so 16 mailed
2/3 of 9 is six left over
looks like if he has six and needs nine then he better buy 3