Module 4 Lesson 8. Objective:  Use math drawings to represent the composition and relate drawings to a written method.

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Presentation transcript:

Module 4 Lesson 8

Objective:  Use math drawings to represent the composition and relate drawings to a written method.

Application Problem  At the school fair, 29 cupcakes were sold and 19 were left over. How many cupcakes were brought to the fair?

Fluency Practice : you will need, personal boards or paper  What is the place value of the digit that’s changing?  124, 134, 144,_____  Count with me saying the value of the digit I’m pointing to  124, 134, 144  Write what number comes next in the pattern.  154  What was the pattern?  Add 10

Sums to Ten  This is the basic problem for a pattern  Once you have solved this problem, solve , …. What would come next?   This is the basic problem for a pattern  Once you have solved this problem, solve , …. What would come next? 

Concept Development you will need place value disks, personal boards, or paper  We’ve been modeling addition with place value disks, but we don’t have to use these disks. We can draw them! Watch.   How many tens in 32?  How many ones?  Let’s count to be sure my drawing is correct.  10, 20, 30, 31, 32.

Concept Development you will need place value disks, personal boards, or paper  Now I’ll add 24 to my drawing. How many tens?  2 tens  How many ones should I draw?  4 ones  Remember to always draw your disks in the correct place value  Let’s count to be sure my model is correct  10, 20, 21, 22, 23, 24.

Concept Development you will need place value disks, personal boards, or paper  Now we solve  Do 2 ones and 4 ones make a ten?  Write the answer below the line in the ones place  Now we add our tens. 3 tens + 2 tens = ?  Write the answer below the line in the tens place  So, equals 56

Concept Development you will need place value disks, personal boards, or paper  Let’s try another one  Write  Draw your number disks to match your number sentence.  Begin adding your ones  What did you notice?  We need to bundle!  What you do to your model you do to your numbers

Concept Development you will need place value disks, personal boards, or paper  On the written addition, we show this new unit of ten by writing a 1 on the line below the tens place. This way we remember to add it in when we count the ten.  Now we add our ones  Now add our tens  =

Concept Development  Now it’s your turn. Draw and solve

Problem Set  Do your best to finish the problem set.  Remember to write/draw your numbers in the correct place value.  Always start with you ones and check if you need to bundle.