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Colored Boxes comes from the Building Thinking Classrooms green book (tasks for K-5). Specifically this is task 9.

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https://mathforlove.com/lesson/pig/

Check out this resource for PIG

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OpenMiddle has plenty of example questions on math calculations and number sense thinking for teachers to choose from.

This video short talks about Sum to 1,000.

Click this link to check out more: https://www.openmiddle.com/

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OpenMiddle resources - this one is “Sum to 1,000”

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https://mathforlove.com/lesson/dont-break-the-bank/

DBtB is a great game to play with your students to help promote number sense and improve addition thinking.

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Put your students up at whiteboards in partners or small groups and play pictionary with them.

Any math words are fair game, but if you need ideas, use this resource (and others like it): http://www.amathsdictionaryforkids.com/

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Math Pictionary - activity for your students

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Number Talks is a great classroom routine to give students agency and promote communication.

Here are more resources to guide you: https://oercommons.org/courseware/lesson/79069/student/?section=7#:~:text=A%20Number%20Talk%20is%20a,computational%20reasoning%20through%20this%20routine.

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it's like Wordle, but with Numbers!

https://nerdlegame.com/

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Nerdle - for boosting operation strategies in math thinking.

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The Tax Man is a great task to give your students in small groups. Play the first round with them where you act as the Tax Man. Once they see the rule that the tax man uses, send them off to figure out whether they can save more "money" from the tax man, and if there is a maximum.

here's a link to this resource: https://www.dsm.fordham.edu/~moniot/taxman.html

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Tax Man - Can you keep more of your paychecks than the tax man takes?  What’s the pattern?