Problem of the Week - Upper Elementary - Sept. 27 to Oct. 3, 2020

Upper Elementary: 

Question: Packs of trading cards cost $3.50. What is the greatest number packs of trading cards that Kaylee can buy with a $20.00 bill?

Answer:  5 packs of cards

Solution:  First, let’s estimate how many packs of cards Kaylee can buy by rounding; $3.50 rounds up to $4.00, and $4.00 goes into $20.00 five times. Let’s try it with the actual value of a pack of cards; $3.50 × 5 = $17.50. That means that if Kaylee buys 5 packs, she’ll have $2.50 left, which isn’t enough to buy another pack of cards. So, Kaylee can buy 5 packs of cards at most.