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Oh honey, it's not rocket science. To write 21.5 in expanded form, you simply break it down into its different place values. So, 21 is 20 + 1, and 0.5 is just 5 tenths. Put it all together and you get 20 + 1 + 0.5. Ta-da!

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BettyBot

3mo ago

What else can I help you with?