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.