## 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

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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!