Subtracting Whole numbers to solve
problems
3rd Grade Math
TEKs: 3.3 B
Oct. 1, 2013
Les
Clear learner objective (I can…)
Materials
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I can select subtraction to solve problems involving whole numbers through 999.
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Journals
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I can use subtraction to solve problems involving whole numbers through 999.
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Index cards
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Construction paper
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Glue
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White boards
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Dry erase markers
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Envision Lesson 5-2
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Dina Zike’s p.12
Essential Questions
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What questions can be answered using subtraction?
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How could you determine if subtraction is required to solve a problem?
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Based on what you know how would you explain subtraction to a 2nd grader?
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How would you justify your result of a subtraction problem?
Writing Prompt
Lesson 5-2 Interactive learning p.96B. Pose problem (modified)
Vocabulary
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Difference
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Subtract
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Less than
Hanna received $172 dollars for in December for good grades. In January Hanna
_____________ for her birthday. _______________________________________ ?
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Left
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Fewer
Centers
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Minus
This will work as independent practice. Students work in groups of 3-4 for 14 minutes then
rotate to another center.
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Remain
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How many/much
more
A bird refuge has 35 cranes. It released 19 of the cranes back into the wild. Explain how many
cranes are left at the refuge?
Complete Story/Problem
 Missing Puzzle: These are the problems of the day, Master p.28 Q12,10, Master
p.27 Q9,10,
 Show Down: These are BQ. 10,21,22,25,26 on p97 of the student’s edition.
Students use Kagan showdown strategy to share work.
 Think Together (5-2 center activity ** Teacher Resource Master p.4)
 Digipath (only if needed): this is the envision online quiz. Students work together
and come to consensuses on answer. Students must show work on paper. Test is
self-graded.
 Think Together (5-2 center activity * Teacher Resource Master p.3) (Extra support)
Subtracting Whole numbers to solve problems
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Today’s Framework
Anticipatory
Set
Daily lesson
Check for
Understanding
Assess
Independent
Practice
Closure
Teacher
Reflection
1. Remind students of subtracting 2 & 3 digit
what is 326 – 119? (Use white boards)
2. Connect to real world
When do people use subtraction? (Class discussion)
Show BBC video
http://www.bbc.co.uk/skillswise/topic/subtraction
(Class discussion)
3. How about in math class? How do you know when to use subtraction to
solve a problem? (class discussion)
Lesson
1. We are going to use vocabulary or key terms to help us. Make sure students
have at least 10 index cards each and a pencil.
2. Now play the envision 5-2 learn presentation start at on the second
forward click. How did they know that they had to subtract? What word helped
them know?
3. Once students tell you the word solve the first problem together. Have
students use the UPSC model by drawing 4qudrants in journal. Model
using ELMO or document camera.
4. Once done repeat the process with the next question. Except this time
have students solve it alone first. Then as a class. Repeat until 34 -16.
5. To get the rest of the key words play the pirate song
http://www.youtube.com/watch?v=v9dx2o7m6GI Pay attention; see how
many more words also mean subtraction?
6. Once all questions and words have been stated build the Pocket book
foldable - Dina zike’s p. 12 – and glue to journal.
Vocabulary
Make sure to define the word, and have student re-estate the meaning in
their own terms.
Is being done though out the lesson using the white boards
Have students complete a story problem.
Then toss it to someone else to check if proper terms where used.
Then toss it again for some one else to solve.
Then have students return it to the original person to make sure the
answer is correct.
Centers:
 Missing puzzle
 Show Down
 Digipath
 Think Together (5-2 center activity ** Mp4)
 Think Together (5-2 center activity * Mp3 for struggling)
1. Using a tossing ball have students tell you another term for subtraction.
2. Have student respond to the writing prompt.
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Subtracting Whole numbers to solve problems
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Subtracting Whole numbers to solve problems
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