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## PowerPoint Slideshow about ' Module 4 ' - gay-mcintyre

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### Module 4

Lesson 4

Objective

- Add and subtract multiples of 10 and some ones within 100.

Place Value

- Say the number.
- What digit is in the tens place?
- What’s the value of the 7?
- State the value of the 1.
- State the place of the 4.
- Let’s try some more by asking the same questions.

174

902

258

734

860

Making a Ten Drill

- 7 + ___ = 10
- Let’s find missing parts to make ten. If I say 7, you would say 3.
- Ready? 7.
- Say the number sentence.
- Let’s try some more numbers:

4

13

3

7

17

23

27

42

48

58

Making the Next Ten to Add

- When I say, 9+4, you say 10+3.
- Ready? 9+4.
- What’s the answer?
- Let’s try some others:

7+6

7+4

19+4

9+6

8+3

8+5

18+5

17+4

29+4

19+6

18+3

17+6

49+4

29+6

48+3

88+5

27+6

67+4

79+4

59+6

Concept Development

- There are 5 yellow cubes. How many linking cubes am I showing in this stick?
- How many in this stick?
- What is the difference between 8 and 5?
- What number sentence could I use to represent the difference between 8 and 5?
- 8–5=3.

Concept Development Continued

- Has the difference changed?
- But what new number sentence can I use to represent the difference between my two sticks?
- 9–6=3.
- Is the difference still 3?
- YES!

Concept Development Continued

- If I add more to each bar. Did the difference change?
- Let’s test this idea. When we add the same amount to each number in a subtraction sentence, the difference stays the same.
- Now let’s try this with a new problem. 34 – 28
- Now that is challenging!
- Try this one: 36 – 30.
- How did you know the answer so fast?
- Yes! Is it easier to subtract just tens!

Concept Development Continued

- Now, can you tell me how
34 – 28 and my other problem, 36 – 30, are related? Turn and talk.

- Now how long is each bar?
- We added 2 to each bar to make the problem easy!
- Now it’s your turn. On your white board, solve these problems by making a tape diagram. Add on to both numbers to make the problem easier.

22-8

26-19

33-18

Concept Development Continued

- There are 6 red cubes on one end and 4 red on the other end. How many yellows are in the middle?
- What is the total number of cubes?
- Let’s make 2 different addition sentences. What is the addition sentence for the total number of cubes?
- Now instead let’s join the 1 yellow with the 6 red.
- How do you know this is true
6+5 = 7+4?

Concept Development Continued

- Let’s use that same idea with larger numbers to make tens.
- Let’s solve 28 + 36.
- What does 28 need to be the next ten?
- What is 2 less than 36?
- How do you know this is true: 28+36=30+34?
- We can also show 2 more for 28 with our number bond.
- Let’s write both models in our journals and explain them to your partner.

Concept Development Continued

- Let’s do some more practice with the following problems:

19+35

36+29

78+24

37+46

Story Problem

- Carlos bought 61 t-shirts. He gave 29 of them to his friends. How many t-shirts does Carlos have left?
- Solve!
- Share!

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