Think About Ten 3-2 Carlos Suzy x

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Presentation transcript:

Think About Ten 3-2 Carlos Suzy x 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 15 21 24 27 30 28 32 36 40 25 35 45 50 42 48 54 60 49 56 63 70 64 72 80 81 90 100 Suzy Carlos © 2014. Teacher to Teacher Publications, Inc.

Multiplying by 10 10 X 6 10 20 30 40 50 60 60 Multiplying by 10 is like skip counting by 10s. Connecting multiplying by ten to repeated addition or skip counting © 2014. Teacher to Teacher Publications, Inc.

Multiplying by 10 1 x 10 = 10 6 x 10 = 60 10 x 2 = 20 10 x 7 = 70 30 8 x 10 = 80 10 x 4 = 40 10 x 9 = 90 Do you see a pattern in the products? 10 x 10 = 100 5 x 10 = 50 What do you notice when multiplying by 10? © 2014. Teacher to Teacher Publications, Inc.

Multiply 5 x 6 5 X 6 30 10 x 6 = 60 30 half of 60 is 30 5 60 5 Using relationship of 5 and 10 as a strategy Multiplying by 5 is like multiplying by 10 and then taking HALF (because 5 is HALF of 10). © 2014. Teacher to Teacher Publications, Inc.

The five facts are just half the tens facts. 7 x 5 Multiply by 10 -- 70 Take half of that -- 35 35 The five facts are just half the tens facts. © 2014. Teacher to Teacher Publications, Inc.

Let’s try that strategy. 5 x 8 = 40 10 x 8= 80 1st multiply by 10 Half of 80 is 40 2nd divide in half © 2014. Teacher to Teacher Publications, Inc.

5 x 9 = 45 10 x 9= 90 Half of 90 is 45 Let’s try that again. 1st multiply by 10 Another example. 2nd Divide in half Half of 90 is 45 © 2014. Teacher to Teacher Publications, Inc.

5 10 9 5 Let’s play “Half of Tens” 5 x 5 is half of 10 x 5 or half 50. It’s 25. 5 x 9 is half 90. That’s 45! 10 x 5 = 50 10 x 9 = 90 Demonstration of the game: Turn over a digit card. First player multiplies it by 10. Second player multiplies it by 5 (or halves the 10 fact that his/her partner just computed). For the next number card, Player 2 goes first. © 2014. Teacher to Teacher Publications, Inc.

Warm Up Game: Half of Tens Materials: A deck of number cards (0-10) Object: Practice multiplying by tens and fives. Rules: Player 1 draws a number card and multiplies it by 10. Player 2 multiplies the same number by 5 (half of the “x10” product). Partners check for accuracy. Allow time for students to play this game to develop fluency with fives using this strategy. © 2014 Teacher to Teacher Publications, Inc.

5 x 6 7 5 Let’s play “Product Crossing with Fives” 5 x 6 is 30. 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 5 x 5 is 25. So I cross off 25. 5 x 6 is 30. 5 x 7=… 10 x 7 is 70. Half of 70 is 35. So 5 x 7 = 35. I can cross off 35. 5 x 6 7 5 Demonstration of the game: Same as twos version. 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 © 2014 Teacher to Teacher Publications, Inc.

Warm Up Game: Product Crossing with Fives Materials: A deck of 0-10 number cards Object: Cross off each of the numbers on the list of products by multiplying correctly and quickly. Rules: Each player makes a list of the products of 5 (0, 5, 10, … 50) and turns that list facedown. Place the first factor card, “5”, on the table. Players take turns: Drawing a card from the deck (the other factor). Multiplying the number on the card by five. If players say the product correctly and quickly, they cross it off the list. Then turn list facedown again. Reshuffle cards as needed. The first player to cross off all the numbers wins. Allow time for students to play this game to develop fluency with multiplying by 5. © 2014 Teacher to Teacher Publications, Inc.