## Act 1

1. How many cups will there be?

2. Write down a guess.

## Act 2

3. What information would be useful to figure this out?

4. Write down some questions you have in your head right now.

## Act 3

## Sequel

What would happen if the first cup had a 10.1 cm diameter?

What would happen if the final cup had a 1.6 cm diameter?

**Common Core Standards**

5.NBT.B.7

Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

**TEKS**

4.4(A)

add and subtract whole numbers and decimals to the hundredths place using the standard algorithm

why stop at 12 cups?

Thanks for the question! There were only 12 cups in the set that we have for our kids.

Not sure I understand “Sequel” . Is it based of the same pattern of a .5 cm decrease each time? Are they two different problems/questions?

Thanks!

Thanks for the questions! It is based on the same pattern, and they are two different problems. So, the first one will start with a cup of 10 cm and finish with a final cup of 2.6 cm. For the second sequel question, the first cup will start at 8.1 cm and end at 2 cm.

I wonder though. If it decreases by .5 cm each time and you start with 10 cm, it doesn’t work out evenly to end at 2.6 cm? Am I missing something? Thanks!

You’re right! I just changed the questions to 10.1 cm and 1.6 cm to make it work out evenly. Double check me though. Thanks for the feedback!