Relate Multiplication and Division How can you use multiplication to divide?

45 + __ = 79

How could you solve this? 45 + __ = 79 How could you solve this?

Use the inverse (or opposite) operation. 45 + __ = 79 Use the inverse (or opposite) operation.

Use the inverse (or opposite) operation. 45 + __ = 79 Use the inverse (or opposite) operation. 79 -45 34

Use the inverse (or opposite) operation. 45 + 34 = 79 Use the inverse (or opposite) operation. 79 -45 34

You can do the same with multiplication and division. Multiplication and division are inverse (or opposite) operations.

20 ÷ 4 = _____ Modeling with drawings/counters You have already learned to solve this problem by: Modeling with drawings/counters Modeling with bar models Using repeated subtraction Using repeated subtraction on a number line Modeling with an array

Today we are going to use multiplication to help us. 20 ÷ 4 = _____ Today we are going to use multiplication to help us.

20 ÷ 4 = _____ is the same thing as 4 x ____ = 20

20 ÷ 4 = _____ 4 x ____ = 20 is the same thing as If you don’t know how many groups of 4 make 20, use an array…

20 ÷ 4 = _____ 4 x ____ = 20 is the same thing as If you don’t know how many groups of 4 make 20, use an array… 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

20 ÷ 4 = _____ 4 x ____ = 20 is the same thing as If you don’t know how many groups of 4 make 20, use an array… 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5

5 20 ÷ 4 = _____ 4 x ____ = 20 is the same thing as If you don’t know how many groups of 4 make 20, use an array… 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5

5 5 So, 20 ÷ 4 = _____ 4 x ____ = 20 is the same thing as If you don’t know how many groups of 4 make 20, use an array… 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5

How can you use multiplication to divide?

Exit Ticket Which equation could help you solve 14 ÷ 2 = k? Write a multiplication equation that could help you find the quotient of 15 ÷ 5.