Lesson objective: Solve problems by taking from.

This lesson provides an opportunity for students to apply their knowledge and understanding of subtraction as removal to a real-life situation. Students are asked to select at least one recess activity to use the last five minutes of recess time before the whistle blows. Students will produce written work to show time used, prepare to share their choices, and report whether they have any time left to line up.

Key Concept students will use:

- Subtraction can be understood as taking from.

Skills students will use:

- Counting one-to-one and counting to tell "how many" (Grade K, Unit 1)
- Understanding that the last number counted in a set stands for the quantity in the set (Grade K, Unit 1)
- Taking from a set with concrete objects to model
- Constructing equations to show removal from a set to find a difference

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they decide which activity to choose and how it affects the minutes left to choose another activity or line up. If minutes are used on an activity, they are taken from the total minutes,, which results in less time left to make another choice or line up.

**Key vocabulary: **

- left
- minus
- subtraction
- take from

**Special materials needed:**

- counters
- five frame
- record sheet (or other option to record thinking)