3.OA.7 Multiply and Divide within 100. Multiply by zero What will the answer be….. 8 X 0 =

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Presentation transcript:

3.OA.7 Multiply and Divide within 100

Multiply by zero What will the answer be….. 8 X 0 =

What will the product be? 1.9 x 0 = 2.0 x 3 = 3.7 x 0 = 4.1,999 x 0 = 5.0 x 99,999 =

What will the product be? 1.9 x 1 = 2.1 x 3 = 3.7 x 1 = 4.1,999 x 1 = 5.1 x 99,999 =

Doubles multiplying by 2 2 x 4 can be thought of as 4 doubled 2 x 6 = ? Explain how you know the answer based on doubles

Doubling twice multiplying by 4 4 x 5 can be thought of as 5 doubled twice Can someone explain this? Does this work anytime you multiply a number by 4?

Doubling three times multiplying by 8 8 x 5 can be thought of as 5 doubled three times Can someone explain this? Does this work anytime you multiply a number by 8?

Tens If we know 6 tens is 60. how can this help us with multiplying by a 10?

Square Numbers Why would we say 9 is a square number? Use 1 inch tiles or draw a picture to make another square number.

Multiplying Nines When you multiply by 9 you can think of as 10 groups minus one group of 3. Explain how you can relate: 3 x 10 = 30 3 x 9 = 27 Try to solve this problem mentally 9 x 6

Decomposing I don’t know what 6 x 7 is I do know 6 x 6 = 36 so I just need one more group of = 42 I will decompose the 8 into 5 and 3 8x x 4 = 20 3 x 4 = 12 What does 8 x 4 = ?

What multiplication problem is represented here?

How can you solve this multiplication problem by splitting it up into two easier known products?

Ready, GO!! 1.4 x x x x 4