Kindergartner multiplies 9,999 x 9 and the answer takes up much of the classroom

One of our New School Montessori kindergartners has been practicing multiplication with 4-digit numbers and grew curious to know what 9,999 times 9 would be. His teachers had to make some new colored stamps of their own to allow him to build a number that large, but it worked and was fun for the whole class. It turns out that you too can multiply 9,999 by 9 if you have enough floor space and numbered stamp tiles!

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