Lesson: Subtracting Integers Mathematics • 7th Grade

In this lesson, we will learn how to understand subtraction, subtract one- or two-digit integers, and apply this to real-life situations.

Lesson Plan

Students will be able to

model the subtraction of integers with number lines,
recognize the relation between subtracting and adding two integers (i.e., subtracting two integers, , is the same as adding to the additive inverse of ),
subtract a negative integer from a positive integer,
subtract from a negative integer,
subtract a positive integer from a positive integer when the difference is less than 0,
solve real-world problems that involve subtracting integers.

Q1:

Fill in the blank: .

Q2:

Find the equation that answers this problem:

Today, Hannah is 37 years old and William is 61 years old. How old was William 23 years ago?

Q3:

Fill in the blank: .