Module 3 Lesson 14.

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Presentation transcript:

Module 3 Lesson 14

Lesson Objective Model numbers with more than 9 ones or 9 tens; write in expanded, unit, standard, and word forms.

Put your name and number at the top of the page. SPRINTS Review of Subtraction in the Teens Put your name and number at the top of the page. Sprint A On your mark, get set, THINK Lets check your work Sprint B

Happy Counting Up and Down by Ones Crossing 100 Let’s play Happy Counting! Watch my fingers to know whether to count up or down. A closed hand means stop. We’ll count by ones, starting at 76. Ready?

Story Problem A second grade class has 23 students Story Problem A second grade class has 23 students. What is the total number of fingers of the students? Read this problem with me. I’m very curious to see what you’ll draw to solve this! Talk with your partner to share ideas, and then I’ll give you 2 minutes to draw and label your picture. Who would like to share their thinking? 230 What? Why is it easier to draw 23 ten-disks than, say, 23 sets of hands? Good reasoning! It’s good to be fast if you can be accurate, but it’s also important to use a strategy that makes sense to you.

Story Problem Continued A second grade class has 23 students Story Problem Continued A second grade class has 23 students. What is the total number of fingers of the students? So how many fingers do 23 students have? 23 students have 230 fingers! Please add that statement to your paper.

Concept Development On your place value mat, show me the number 14. Materials: Place value disks, place value mat, pencil and paper, Problem Set On your place value mat, show me the number 14. What disks did you use from greatest to smallest? 1 ten and 4 ones. Now change 1 ten for 10 ones. What disks did you use this time? 14 ones. Discuss with your partner why the statement below is true. 1 ten 2 ones = 12 ones. Who would like to share their thinking?

Concept Development Continued Show me the number 140 to me with your disks. What place value disks did you use from greatest to smallest? 1 hundred 4 tens. Change 1 hundred for 10 tens. What disks did you use this time? 14 tens. Touch and count by tens to find the total value of your tens. Ready? What is the value of 14 tens? Answer in a full sentence, “The value of 14 tens is….” The value of 14 tens is 140. Discuss why the statement below is true with your partner 1 hundred 4 tens = 14 tens Now discuss with your partner why this is true. 14 tens = 140 ones

Concept Development Continued Show me the number 512. What disks did you use? 5 hundreds 1 ten 2 ones. Change 1 ten for 10 ones. 5 hundreds 12 ones. Discuss why the statement below is true. 5 hundreds 1 ten 2 ones = 5 hundreds 12 ones. First model A and then B. Tell the total value of each number you model. A B 1 hundred 5 tens 2 ones 15 tens 2 ones 11 tens 1 hundred 1 ten 1 ten 3 ones 13 ones 12 tens 9 ones 1 hundred 2 tens 9 ones

Review Say 206 in expanded form. 100 + 100 is? 100 is how many tens? 10 tens + 10 tens is? 20 tens. 20 tens is ? 200.

Review Continued 206 = 2 hundreds 6 ones = 20 tens 6 ones. Talk to your partner about why this is true. We can have more than 9 units. Let’s try some. The value of 30 tens is? 300. 18 tens? 180.