# Band-Aids

It is Monday morning. The school nurse opens a new box of band-aids. The school nurse puts a band-aid on forty-three students. At the end of the day the school nurse has thirty-two band-aids remaining in the box. How many band-aids were in the box before it was opened by the school nurse? Show all your mathematical thinking.

### More Accessible Version

It is Monday morning. The school nurse opens a new box of band-aids. The school nurse puts a band-aid on twenty-five students. At the end of the day the school nurse has five band-aids remaining in the box. How many band-aids were in the box before it was opened by the school nurse? Show all your mathematical thinking.

### More Challenging Version

It is Monday morning. The school nurse opens a new box of band-aids. The school nurse puts a band-aid on thirty-six students before lunch. The school nurse puts a band-aid on thirty-eight students after lunch. At the end of the day the school nurse has one band-aid remaining in the box. How many band-aids were in the box before it was opened by the school nurse? Show all your mathematical thinking.

## Plan

#### Underlying Mathematical Concepts

#### Possible Problem-Solving Strategies

#### Formal Mathematical Language and Symbolic Notation

A student may independently select a printed number line, number chart, ten frames, graph paper, etc. as they work on a task.

### Suggested materials

Engagement Image:

Teachers may project the image below to launch this task for their students, define nouns, promote discussion, access prior knowledge, and inspire engagement and problem solving.