### Module 4

```MODULE 4
Lesson 4
Objective
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?
174
• State the value of the 1.
• State the place of the 4.
• Let’s try some more by asking the same questions.
258
734
860 902
Making a Ten Drill
• 7 + ___ = 10
• Let’s find missing parts to make ten. If I say 7, you would
say 3.
• Say the number sentence.
• Let’s try some more numbers:
4
23
3
27
7
42
13
17
48
58
Making the Next Ten to Add
• When I say, 9+4, you say 10+3.
• Let’s try some others:
19+4
9+6
8+3
8+5
7+6
7+4
29+4
19+6
18+3
18+5
17+6
17+4
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
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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
• I add more to each bar. Did the
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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
numbers to make the problem
easier.
22-8
26-19
33-18
Concept Development Continued
• There are 6 red cubes on one end
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and 4 red on the other end. How
many yellows are in the middle?
What is the total number of cubes?
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
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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 tshirts does Carlos have left?
• Solve!
• Share!
```