Module 4 Lesson 1.

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Presentation transcript:

Module 4 Lesson 1

Objective Relate 1 more, 1 less, 10 more, and 10 less to addition and subtraction of 1 and 10.

Place Value Materials: Place value charts and personal white boards. Show 5 ones in number disks. Write the number below it. Show 2 tens disks and write the number below it. Say the number in unit form. 2 tens 5. Say the number in standard form. 25.

Place Value Continued Add 1 to your chart. What is 1 more than 25? Now add 1 ten to your chart. What is 10 more than 26? Subtract 1 from 36 by crossing out a 1. What is 1 less than 36? Now subtract 10 from 35 by crossing out 1 ten. What is 10 less than 35?

More/Less For every number I say, you say a number that is 1 more. If I say 5, you would say 6. Ready? 5 8 9 16 19 28 38 39 44 49 54 60

More/Less Continued Now for every number I say, you say a number that is 10 more. If I say 50, you would say 60. Ready? 50 83 30 80 40 20 21 28 30 35 45 56

More/Less Continued Let’s try saying 1 less for every number I say. If I say 6, you would say 5. Ready? 6 9 40 8 11 14 19 20 30 31 51 50

More/Less Continued Now for every number I say, you say a number that is 10 less. If I say 50, you would say 40. Ready? 50 30 99 80 17 70 100 51 41 46 28 18

Story Problem In the morning, Jacob found 23 seashells on the beach. In the afternoon, he found 10 more. In the evening, he found 1 more. How many seashells did Jacob find in all? If he gives 10 to his brother, how many seashells will Jacob have left? RDW! Who would like to share their findings?

Concept Development Materials: Place Value Chart, Disks (and Sentence Frames) Use your number disks to show me 36 on your place value chart. Show me 1 more. Use a sentence frame to describe adding one to 36. 37 is 1 more than 36.  1 more than 36 is 37. What did you do to change 36? Give me an addition sentence starting with 36. 36 + 1 = 37. Start with 37. 37 = 1 + 36.  37 = 36 + 1.

Concept Development Continued Show me 36 again. Show me 1 less than 36. Use a sentence frame to describe taking away 1 from 36. 35 is 1 less than 36.  1 less than 36 is 35. What did you do to change 36? Give me a subtraction sentence starting with 36. 36 - 1 = 35. Start with 35. 35 = 36 - 1.

Concept Development Continued Show me 36 again. Show me 10 more than 36. Use a sentence frame to describe adding ten to 36. 46 is 10 more than 36.  10 more than 36 is 46. What did you do to change 36? Be specific. Where did you add the ten? Give me an addition sentence starting with 36. 36 + 10 = 46. Start with 46. 46 = 10 + 36.  46 = 36 + 10.

Concept Development Continued Show me 36 again. Show me 10 less than 36. Use a sentence frame to describe taking away 1 from 36. 26 is 1 less than 36.  10 less than 36 is 26. What did you do to change 36? Give me a subtraction sentence starting with 36. 36 - 10 = 26. Start with 26. 26 = 36 - 10.

Concept Development Continued Talk with your partner. Use place value language to explain what you understand about 1 more, 1 less, 10 more, and 10 less. Listen as I say a number pattern. Raise your hand when you know the more or less rule for my pattern. If I say, “45, 46, 47, 48, 49,” you say, “1 more.” Wait for my signal. Ready? Remember to raise your hand when you know the more or less rule for my pattern. Here we go! 23, 33, 43, 53, 63. 10 more! 76, 75, 74, 73, 72. 1 less!

Concept Development Continued Take out your white boards. Now I’ll write a series of numbers on the board. You will write the rule and the next three numbers. Turn your board over when you have written your answer. Wait until I say, “Show me.” Ready? Show me. The rules are + 1, ─1, + 10, and ─10 18, 17, 16, ___, ___, ___. 25, 35, 45, ___, ___, ___.

Concept Development Continued Let’s try something different. What is 33 + 10? Show me. -1? Show me. -10? Show me. 43 42 41 31 21