How can I subtract by using addition? Isn’t addition the opposite of subtraction?

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Presentation transcript:

How can I subtract by using addition? Isn’t addition the opposite of subtraction?

In this lesson you will learn how to subtract two 2-digit numbers by using addition.

Let’s Review Subtraction: Finding the difference between 2 numbers. We can count back from the larger number… Or, we can count up from the smaller number.

Subtraction: Counting Back: = Counting Up: ? = 47 15

Open Number Lines Open number lines can help us add and subtract. I can jump by tens and ones to find the sum or difference of 2 numbers = 3

A Common Misunderstanding Thinking that the 8 in 87 has a value of 8 instead of X

Core Lesson Subtract by counting up. When we subtract we want to find the difference between 2 numbers. How many more are needed to get 63 when we add up from 32? 32 + ? = 63

An open number line can help us count up! ? = 31 = ? = 63 31

Core Lesson Subtract by counting up ? How far away is the nearest 10? Can I hop by multiples of 10 on the number line? = ? = = 59

In this lesson you have learned how to subtract two 2-digit numbers by using addition.