Here's a product that is a great way for your students to practice place value. It can be used as a math center (with students using clothespins to pick the correct answer) or like a write the room activity (students can use the recording sheet to write the correct answer).
It goes from 21-40 and uses base ten blocks. I have also included 2 different recording sheets, one just has students write the value and the other one has students write how many ones and tens (if any).
I also have this same product with the numbers from 1-20:
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