Chapter 1 Getting ready for Addition and Subtraction concepts PowerPoint by Susie Mumper 3 rd Grade HES 2011
Dec 26, 2015
Chapter 1
Getting ready for Addition and Subtraction concepts
PowerPoint by Susie Mumper3rd Grade HES2011
Lesson 1.6 objective – To use the problem solving skill choose the operation.
• Let’s chill out while we practice some math.• Time for some practice. Turn to p. 13 and we
will do numbers 1-4.
Math task
1. Math book p. 13 numbers 5-7 all.2. In your math journal answer this question:
Kevin has 56 stamps. Jill has 38 stamps. Write one addition and one subtraction problem using this information.– Remember you need to restate the question in
your answer , write in complete sentences and show your work.
3. Math game from the black box
Home
Lesson 1.5 objective – To subtract 2-digit numbers with and without regrouping.
• Khan academy subtraction 2• Now let’s practice. Turn in your math book to
p. 10 and we will do numbers 2-6 together.
Math task
1. Math book p. 11 numbers 7-37 odd2. In your math journal answer this question:
How does the inverse operation help you in subtraction?– Remember you need to restate the question in
your answer , write in complete sentences and show your work.
3. Math game from the black box
Home
Lesson 1.4 objective – To add 2 – digit numbers with and without regrouping.
• http://www.khanacademy.org/video/addition-2?playlist=Arithmetic
Math task
1. Math book p. 9 numbers 7-29 odd2. Answer this question in your math journal:
How would you add 54 and 28?3. Math game from the black box
Home
Lesson 1.3 objective – To use properties of addition
• What is the order property of addition?– You can add two or more numbers in any order and get the same
sum.– 6 + 7 = 13 or 7 + 6 =13
• What is the identity property of addition?– When you add zero to a number, the sum is that number.– 2 + 0 = 2 or 34 + 0 = 34 or 259 + 0 = 259
• What is the grouping property of addition? – You can group addends in different ways and still get the same
sum.– (9 + 1) + 4 = 14 or 9 + (1 + 4) = 14
Math task
1. Math book p. 7 numbers 5 – 21 odd.2. In your journal write a number sentence to
go with each of the addition properties listed on p. 6 in your math book.
3. Math game from the black box.
Home
Lesson 1.2 objective – To solve number sentences for missing addends.
• Today we are going to learn about missing addends.
• http://www.harcourtschool.com/activity/show_me/e453.htm
• http://teams.lacoe.edu/documentation/classrooms/linda/algebra/activities/hunt/hunt.html
Math task
1. MB p. 5 numbers 6-28 even.2. Find this missing addends and write them in
your journal:– 5 + ___= 12– ___ + 8 = 10– 9 + ___ = 15
3. Math game from the black box
Home
fact family
A fact family is a set of related addition and subtraction number sentences that use the same numbers.
4 + 7 = 1111 – 4 = 7
inverse operations
Inverse operations are operations that undo each other, such as addition and subtraction. They are opposites.
Order Property of Addition
The order property of addition states that when you add two numbers in any order, you get the same sum.
7 + 6 = 13 and 6 + 7 = 13
Identity Property of Addition
The identity property of addition states that when you add zero to a number, the sum does not change
12 + 0 = 12
Grouping Property of Addition
The grouping property of addition states that when you add three or more addends in different ways, the sum stays the same.
(9 + 1) + 4 = 9 + (1 + 4)10 + 4 = 9 + 5
14 = 14
Home
Lesson 1.1 Objective – To identify and write related addition and subtraction facts
The pictograph shows some of the animals on Brittany's farm
Animals on Brittany’s farm
Chickens
Cows
Ducks
Sheep
Key: Each = 2 animals
How many duck and chickens are there?
•Let’s skip count the ducks by 2’s. Ducks =•Now let’s do the same thing for chickens. Chickens=•Now let’s add them together.
•So 8+6=14 or 6+8=14
Animals on Brittany’s farm
Chickens
Cows
Ducks
Sheep
Key: Each = 2 animals
The numbers 6,8 and 14 can be used to make a fact family.
• What is a fact family?• A fact family is a set of related addition and
subtraction number sentences that use the same numbers.
• What are the number sentences in the 6,8,and 14 fact family?
• Fact families are examples of inverse operations.
• What are inverse operations?• Inverse operations are opposites. So addition
and subtraction are inverse operations.• What is another example of inverse
operations?
Math task
1. MB p. 3 numbers 8-26 even. When you finish stack them neatly in one stack on my desk.
2. Write the facts for these fact families in your math journal: 4,2 and 6; 6, 2, and 8; 1, 14, and 15; 8, 2, and 10; and 6, 13; and 19.
3. Math game from the black box.
Home