Harrison Stationery sells cards in packs of 5 and envelopes in packs of 16. If Eddie wants the

same number of each, what is the minimum number of cards that he will have to buy?

The smallest amount of cards he needs to buy is 80.

Step-by-step explanation:

What Eddie wants to find is the least common multiple. What a least common multiply is that you try to find the smallest number that both 5 and 16 go into.

Step 1: Find the LCM of 5 and 16

5 - > 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80

16 - > 16, 32, 48, 64, 80

Answer: The smallest amount of cards he needs to buy is 80.