Math Lesson
Name:
o Linsy Bowers
Lesson Adapted From:
Discipline:
o Mathematics
Grade Level:
o 3rd Grade
Focus:
o Determine unknown factors in division problems.
Standards:
o 3.OA.4
Determine the unknown whole number in a multiplication or division equation relating three whole numbers.
Objectives:
o The student will be able to determine an unknown number in a division problem.
Assessment:
o Formative:
- Proficiency Scale: The students will use the proficiency scale as a self-assessment.
o Summative:
-Students will take a picture or screenshot of their “Missing Divisor Game” after they get 10 correct problems.
Materials:
o Computer o Paper o Pencil
Procedure:
o Anticipatory Set:
- The students will watch this video.
• https://youtu.be/iGASHBWBDU4 o Direct Instruction (I do):
- The students will watch this video.
• https://youtu.be/V43E0Ow-N6g
Introduce vocabulary words:
• Dividend-the number that is being divided up • Divisor-the number that you are dividing by or how many equal groups you will create • Quotient-the answer to a division problem
Explain to students how to find the unknown factor in a division problem if the unknown is in the middle of the equation.
Example:
81 ÷ ___ = 3
Explanation: We would divide the dividend and the quotient.
Explain to students how to find the unknown factor in a division problem if the unknown is at the beginning of the equation.
Example:
___ ÷ 3 = 63
Explanation: We would multiply the divisor and the quotient.
Explain to students the proficiency scale and how it will be used in this lesson. Math 3rd Grade Proficiency Scale
4 I can also solve real world problems using multiplication and division 3 I can: Standard: -Use unknown numbers to 3.OA.4 solve multiplication and division problems. 2 Vocabulary: Skills: -dividend -know how to multiply and -divisor divide within 100 -quotient -know when to multiply and divide in word problems -use equations with unknowns in multiplication and division problems 1 With help o Guided Practice (We do):
-Let’s do a problem together!
-The students will watch this video.
• https://youtu.be/PIsqqXbtPOI
Question: I have 15 basketballs. I have 3 baskets. How many basketballs will be in each basket? So here is our equation: 15 ÷ 3 = ___
This problem tells us that we must divide the 15 basketballs into 3 equal groups. We will put a basketball into each basket until all the basketballs are gone. How many basketballs will be in each group? 5! That is correct
o Independent Practice (You do):
-Play Missing Divisor Game (the student will play until they get 10 correct)
• https://toytheater.com/missing-divisor/
-Students will email or upload a picture or screenshot of their game after they get 10 problems correct. This allows me to see if they are struggling to understand how to find unknown factors in a division problem.
Modification:
o Students may use rows and groups to find unknown factors o For example: 7 x ? = 14 -One row is 7 -Two rows of 7 is 7+7 How many rows are there? That’s right, 2! So that makes the equation 7 x 2 = 14
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