Teaching Demo: Geometric Sequences and Series

Silivia is organizing her books and putting them on shelves. She put 2 books on the first shelf, 8 books on the second shelf, 32 books on the third shelf, and 128 books on the fourth shelf. What do we call this organization mathematically?

• Geometric series

• Geometric sequence

• Arithmetic sequence

• I don't know

Find a formula for the following sequence : 4,8,12,16,20,...

• 4n

• 2n

•Infinitely many mathematicians walk into a pizza restaurant.

 The first says, "I'll have one pizza." The second says, "I'll have half a pizza." The third says, "I'll have a quarter of a pizza”, and so on ..

•How many Pizzas should the waiter give them????

• 1

• 2

• 5

• infinity

What did you like about today's lesson?

Did you like geometric series?

• Yes

• a bit

• No, I hate Math!

• I loved it!