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.

Click image to enlarge

Possible Solutions

Solutions tabs

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