8/31/26 - Teachers and Parents - You can now purchase a "forever" pass to MrNussbaum.com for $89. Your one-time purchase entitles you and your students to unlimited use of the entire site. It will never recur or renew. An annual subscription can always be purchased for $49 or a monthly subscription for $9.99.

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This activity will get students ready to play Mathepillar. Which number is missing from the mathepillar? It gives immediate feedback.

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