Illuminations: Shirts Full of Buttons
Illuminations (National Council of Teachers of Mathematics)

Students explore subtraction in the comparative mode by answering questions of “How many more?” and “How many less?” as they match sets of buttons.

Illuminations: Comparing Columns on a Bar Graph
Illuminations (National Council of Teachers of Mathematics)

During this lesson, students apply what they know about comparison subtraction by constructing bar graphs and using the graphs to answer questions.

Illuminations: Combining Foods
Illuminations (National Council of Teachers of Mathematics)

In this lesson, students explore addition and comparison subtraction by modeling and recording related addition and subtraction facts for a given number.

Illuminations: Wrapping Up the Unit
Illuminations (National Council of Teachers of Mathematics)

During this final lesson in the unit, the students use the mathematical knowledge and skills developed in the previous lessons as they visit five stations to review comparative subtraction.

Illuminations: Bar Graph Investigations
Illuminations (National Council of Teachers of Mathematics)

During this lesson, the students apply what they know about comparison subtraction by constructing bar graphs and using them to answer questions.