Lesson: Subtracting Ones from Two-Digit Numbers on a Number Line Mathematics • 2nd Grade

In this lesson, we will learn how to subtract a one-digit number from a two-digit number when crossing a ten by modeling two jumps on a number line.

Lesson Plan

Students will be able to

count back along a number line to subtract a single-digit number from a two-digit number,
use partitioning to help subtract across a 10,
apply knowledge of subtracting using a number line when solving word problems.

Q1:

Use the number line to calculate .

Q2:

There are 15 students in a class. 6 of them are girls. Use the number line to find how many boys are in that class.

Q3:

What are the two numbers that should fill the empty boxes on this number line?

What is the calculation shown by this number line?