Act 1:

How many cups will there be?

Act 2:

What information would be useful to figure this out?



Act 3:


What would happen if the first cup had a 10 cm diameter?

What would happen if the final cup had a 2 cm diameter?

Official Lesson Page:


  • Common Core
    • 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 (2015-2016)
    • 4.4(A) – add and subtract whole numbers and decimals to the hundredths place using the standard algorithm

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