Over the course of 3 class periods of roughly 35 minutes each, students will use and enhance their counting and measuring skills to make 3 batches of playdough. The challenge concludes with students taking the least successful batch, and trying to strategically improve it by adding a specific number of Tablespoons of one or more ingredients based on their observations.

This lesson provides a real-life context to build upon students’ growing capacity to count within 20. It also supports the development of foundational ideas in measurement including the importance of iterating a standard unit. Standard for Mathematical Practice #5 — Use Appropriate Tools Strategically, and SMP #6 — Attending to Precision are focal. The lesson cycle concludes with an opportunity for students to explore realistic numbers beyond 20 and the foundational computation concept that many small numbers can be put together in order to make a larger number.

### Prior Experience:

- Counting: This learning cycle would be best after a few months of school when most students are meaningfully counting within 20 (beyond rote counting) and are becoming comfortable exploring numbers beyond 20. Students should have experience “counting on” from a given number. (Note: the standards call for proficiency within 20 by year’s end, but that does not mean counting should stop at 20 until students have mastery. Rather, real proficiency within 20 entails exploring numbers beyond without an expectation of mastering those.)
- Measuring: Experience measuring using standard kitchen measuring tools is useful but not essential.

### Learning Cycle Wrapup:

Conclude the lesson with a whole class discussion in which the students talk about what they learned. Prompts may include:

- What did you learn about measuring?
- What did you learn about attending to precision?
- How did your estimates compare with your actual number of spoonfuls in your revised playdough? How did your results come out? What would you do differently?
- How did you handle counting larger numbers? What strategies did you get to practice?
- How did you and your partner work together?
- What did you learn about playdough and how to make it?

This is also a time when the teacher can share his/her observations about what students were doing and how they were improving. Highlights might include projecting digital photos of students while they worked, showing better measuring techniques, counting strategies observed, use of comparison language, recording numbers, etc.

Highlight for students how the lesson cycle helped them learn a few new things and get better at (practice) many things they had done before.

Highlight their growth in important mathematical practices.

Ask students how making playdough connects with other things they like to make, and reflect upon the process of revising something that you’ve made that didn’t turn out well.

Wrap up the cycle by letting students know that you will share the recipes with them and their family (e.g., in the class newsletter or website) and that they can make more at home and teach their families how to make playdough using 4 simple ingredients.

### Assessment:

Assessment for this lesson cycle is formative. Throughout the teacher should be making note of students’ growth in the following:

- SMP 5: Do students improve in their use of Tablespoons and their understanding of Tablespoons as a standardized measure, learning to level each spoonful so that the same amount is used each time they make a spoonful? (Note – there are connections here to conservation concepts as well.)
- SMP 6: Are students improving throughout the lesson in working with their partners to count and measure carefully? Are they consistently using one-to-one correspondence?

**For Math Content Standards: **

Are students demonstrating increasing capacity to count accurately up to and beyond 20? Are they improving at “counting on”? Are they able to read and write those numbers? Are they able to compare quantities using more and less than ideas? Are they able to move between concrete, symbolic, and abstract uses of numbers?

If a more formal assessment is called for, students could work with the original Blue Playdough recipe and compute the wet total Tablespoons, dry total Tablespoons, and recipe totals Tablespoons independently to see how they are progressing.