Lesson: Subtracting Ones from Teen Numbers: Number Line Elementary School • Mathematics • 2nd GradeMathematics
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.
Sample Question Videos
Help Amelia answer a subtraction problem. She wants to find 13 take away 7.
First, she took away 3 to make 10. How much is left to take away?
What is 13 take away 7?
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?
Use the number line to subtract.
Hint: Subtract to make 10 first.