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.
Sample Question Videos
What is 13 minus 4?
Hint: Finish the calculation on the number line. How many more do you have to take away?
What is 15 take away 7?
Hint: Use a number line and subtract to make 10 first.
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?