# Lesson 12 School Supplies

Let’s find the difference between quantities.

## Warm-up Notice and Wonder: School Supplies

What do you notice?

What do you wonder?

## Activity 1 Not Enough Pencils

There are 10 students at the table.

There are 6 pencils.

How many students won’t get a pencil?

Show your thinking using drawings, numbers, or words.

## Activity 2 Compare Problems

There are 9 markers in a bin.

There are 4 caps for the markers.

How many more caps are needed so that each marker has a cap?

Show your thinking using drawings, numbers, or words.Equation:

There are 2 folders on the teacher’s desk.

There are 9 folders on the supply table.

How many fewer folders are there on the desk than the table?

Show your thinking using drawings, numbers, or words.Equation:

There are 5 dry erase boards at each table.

There are 8 markers at each table.

How many more markers are there than dry erase boards at each table?

Show your thinking using drawings, numbers, or words.Equation:

## Practice Problem

## Problem 1

There are 10 dragons in the cave.

There are 3 dragons flying outside.

How many fewer dragons are flying than are in the cave?

Show your thinking with drawings, numbers, or words.