Lesson: Subtracting Ones from Teen Numbers: Number Line Mathematics • 2nd Grade

In this lesson, we will learn how to model subtraction of a one-digit number from a teen number on a number line by making a jump to ten and then a jump to the result.

Lesson Plan

Students will be able to

break apart the subtrahend in an equation to make 10,
model subtraction on a number line:
- subtract to make 10,
- subtract the remaining ones,
write a subtraction equation showing the subtraction of a one-digit number from a teen number,
subtract using labeled number lines and open number lines.

Lesson Video

Lesson Worksheet

Q1:

What is 13 minus 4?

Hint: Finish the calculation on the number line. How many more do you have to take away?

Q2:

What is 15 take away 7?

Hint: Use a number line and subtract to make 10 first.

Q3:

Look at how David used a number line to find 15 take away 8.

First, he took away 5 to make 10.

How much was left to take away?

What is 15 take away 8?