***This lesson coincides with Break time from A Whack on the Side of the Head by Roger von Oech.**

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**Lesson written by:** Jana Raab & Patricia Valdespino

**Grade level range:** 2-7

**Length of time to teach lesson:** 5 minute brain breaks

**Summary of lesson: **Number sense activities that reinforce math concepts and vocabulary. These are quick brain breaks. Students do mental math and exercise their brains.

**Objectives (Learning targets) of this lesson: **Students will find the mystery number/target number using mental math, math vocabulary and perseverance strategies. Students will also be challenged to create their own puzzle using math vocabulary and concepts learned for their classmates to solve.

**What resources/supplies/handouts are needed to teach this lesson: **Hundreds Chart, Target Number Circle Map, Mystery Number Puzzles, Rubric for Assessment

**Step-by-step teaching instructions:**

*Mystery Number Puzzles/Mental Math Puzzles*

Give students a hundreds chart (optional).

Read the clues aloud.

Student will do mental math to find the mystery number.

*Student Mystery Number Puzzles*

Give each student a blank mystery number card.

The student has to generate steps and directions to lead their classmates to a number. Students must use key vocabulary in their clues.

Students share aloud to the class while their classmates solve.

Discuss if the clues were correct and lead them to the number they were thinking of. If it is a good puzzle, add to your Mystery Number Ring.

*Target Number*

Choose a number.

Students generate as many different ways they can to make that number. Students can use any strategies or concepts they know. Examples: multiply, divide, add, subtract, money, word problems, etc…

**Assessment: ** Ask students to rate one another’s work using the rubric.