Unit 2, Lesson 1
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Unit 2, Lesson 1 Addition Facts Strategies
Unit 2, Lesson 1 Unit 2, Lesson 1 Unit 2, Lesson 1 Unit 2, Lesson 1
Addition Facts StrategiesAddition Facts Strategies
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Unit 2, Lesson 1 Addition Facts Strategies
Goals• Commutative and associative
properties of addition• Practice addition facts strategies
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Unit 2, Lesson 1 Addition Facts Strategies
What We Will Learn Today
• We are going to learn that we can add numbers in any order and still get the same answer.
• That can group numbers together any way we want when we add.
• It is easier to add numbers when you make groups of ten.
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Unit 2, Lesson 1 Addition Facts Strategies
Using a Ten• You will work in pairs.
• Each pair will have 40 connecting cubes.
• Materials getters, please get a bag of cubes and give 4 trains of 10 to each pair in your group. Please make sure that they have four different colors.
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Unit 2, Lesson 1 Addition Facts Strategies
Using a Ten• You have enough cubes for you to
do some of these activities on your own.
• Some of the activities will require that you work together with your cubes.
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Unit 2, Lesson 1 Addition Facts Strategies
Using a Ten• I want each student to take two
different colors of connecting cubes.
• Build one train with 7 cubes of one color.
• Building another train with 8 cubes of another color.
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Unit 2, Lesson 1 Addition Facts Strategies
Using a Ten• What can you do with your cubes to
make a train of ten?• Yes, move two cubes from the train of
seven cubes to the train of eight cubes.
• Or, move three cubes from the train of eight cubes to the train of seven cubes.
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Unit 2, Lesson 1 Addition Facts Strategies
Using a Ten• You now have a train of 10 cubes and
a train of 5 cubes. What is the sum?
• 15
• Why is this problem (10 + 5) easier to solve than the first one (7 + 8)?
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Unit 2, Lesson 1 Addition Facts Strategies
Vocabulary• Addend – a number that is
added to another
• Sum – the answer to an addition sentence
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Unit 2, Lesson 1 Addition Facts Strategies
Teaching the Activity• Do the following problems by
making a train of one color for the first addend and a train of another color for the second addend.
• 6 + 7• Why is 10 + 3 easier to solve than 6 + 7?
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Unit 2, Lesson 1 Addition Facts Strategies
Teaching the Activity• 8 + 8
• Why is 10 + 6 easier to solve than 8 + 8?
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Unit 2, Lesson 1 Addition Facts Strategies
Teaching the Activity• 8 + 9
• Why is 10 + 7 easier to add than 8 + 9?
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Unit 2, Lesson 1 Addition Facts Strategies
Switch It!• These next problems you will have
to do in pairs.• Solve 14 + 7 + 6 with connecting
cubes. Use a different color for each addend.
• Group the cubes in as many tens as possible.
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Unit 2, Lesson 1 Addition Facts Strategies
Switch It!• What can you do with the train of
14?• What can you group together to
make a ten?• What is your answer?
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Unit 2, Lesson 1 Addition Facts Strategies
Switch It!• Let’s share your solutions.
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Unit 2, Lesson 1 Addition Facts Strategies
Challenge• Try to add 14 + 7 + 6 using
mental arithmetic. • See if you can rearrange any of
the numbers to make groups of ten.
• How did you solve this without paper, pencil or cubes?
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Unit 2, Lesson 1 Addition Facts Strategies
More Problems• Do these problems first with
mental addition. Try to find groups of 10. You may also use doubles.
• Then use your cubes.• 8 + 7 + 12• 6 + 8 + 14• 11 + 3 + 9
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Unit 2, Lesson 1 Addition Facts Strategies
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Unit 2, Lesson 1 Addition Facts Strategies
Vocabulary• Partition – To divide into parts.
• Ex: 7 can be divided into 5 and 2
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Unit 2, Lesson 1 Addition Facts Strategies
Breaking Addends into Parts
• Sometimes addends can be easily grouped into tens.
• Sometimes this isn’t easy to see.
• Try partitioning addends before finding groups of ten.
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Unit 2, Lesson 1 Addition Facts Strategies
Breaking Addends into Parts
• Example: 7 + 5 + 2• The second addend, 5, can be
rewritten as 3 + 2.• 7 + 3 + 2 + 2• What two numbers can you group
together to make 10?• What is the sum?
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Unit 2, Lesson 1 Addition Facts Strategies
Breaking Addends into Parts
• Work with your partners to solve the following problems.
• Use your math notebook to write the number sentence and then show how you partitioned the number.
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Unit 2, Lesson 1 Addition Facts Strategies
Breaking Addends into Part
•6 + 8 + 3•9 + 7 + 2•4 + 9 + 3•Let’s compare your solutions.
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Unit 2, Lesson 1 Addition Facts Strategies
My Calculator is Broken• We are going to imagine that
some of the keys on the calculator are broken.
• That means that you cannot use those keys.
• .
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Unit 2, Lesson 1 Addition Facts Strategies
My Calculator is Broken• First, let’s imagine the five is
broken.• What keys would you press to do
the problem 9 + 5 + 2?• Share your solutions.
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Unit 2, Lesson 1 Addition Facts Strategies
My Calculator is Broken• Do these additional problems
without using the 5 key.• 8 + 5• Share your solutions• 5 + 7 + 6• Share your solutions
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Unit 2, Lesson 1 Addition Facts Strategies
My Calculator is Broken• 15 + 6 + 3• Share your solutions• 9 + 25• Share your solutions
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Unit 2, Lesson 1 Addition Facts Strategies
What We have Learned• We learned that we can add
numbers in any order and still get the same answer.
• We can group numbers together any way we want when we add.
• It is easier to add numbers when you make groups of ten.