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?

School supplies. pencils, crayons, paint, paint brushes, number cubes, sticky notes, paperclips.

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

Markers in a bin.

  1. 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:

  2. 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:

  3. 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.