By Megan Hickam If you are looking at these activities at home have a parent or adult help you What is addition Definition If A and B are nonnegative numbers then we can define the sum AB as the total numbers then we can define the sum AB as the total number of objects we will have if ID: 791345
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Slide1
Learning How to Add and Subtract!
By: Megan Hickam
If you are looking at these activities at home have a parent or adult help you
Slide2What is addition?
Definition:
If A and B are non-negative numbers, then we can define the sum A+B as the total numbers, then we can define the sum A+B as the total number of objects we will have if we start with A objects and then get B more objects
Slide3BUT WHAT DOES THIS MEAN?!?!?!?!?!?!?!?!
Slide4Who likes candy?
What is your favorite kind?
Slide5CANDY EXAMPLE PROBLEM
Your teacher gives you 2 recces pieces. At lunch time your friend gives you 1 more recess pieces. How many pieces of recess pieces do you have?
Slide6How many recces pieces did your teacher give you?
2
pieces
Slide7How many
more recces pieces did your friend give you at lunch
1Piece
Slide8How many recess pieces do you have now?
How many pieces did your teacher give you?
How many pieces did you friend give you?
Count the total number of pieces. How many pieces did you count?
Slide9HOW many total recess pieces do you have?
1
2
3
3 recess pieces
total
Slide10Using numbers!
2
1
+
=
3
Slide11Do you get it?
Try these examples on your own use the candy problem to help you
Slide12Your mom gives you 5 vanilla cupcakes and 5 chocolate cupcakes to share with your friends. How many cupcakes did your mom give you?
Slide13How many vanilla cupcakes did your mom give you?
5
vanilla cupcakes
Slide14How many chocolate cupcakes did you mom give you?
5
chocolate cupcakes
Slide15How many cupcakes did your mother give you to share with your friends?
COUNT THE CUPCAKES!
Slide16Count the cupcakes
10 cupcakes to share
1
2
3
4
5
6
7
8
9
10
Slide17What did we just do?
WE ADDED!
5 vanilla cupcakes
+
5 chocolate cupcakes
=
10 cupcakes!!!!
Slide18You and your friend are each making a cake. The recipe calls for 2 cups of sugar. How much sugar will you and your friend need to make 2 cakes?
Slide19How much sugar does one cake recipe require?
1
2
Slide20How much sugar will two cake recipes require?
Count the number of cups!
Slide21How much sugar will two cake recipes require?
Count the number of cups!
1
2
3
4
Slide22What did we just do?
2 cups = 1 cake
2 cups = 1 cake
+
=
?
Slide234 cups of sugar!
Slide24What is subtraction?
Definition:
If A and B are non-negative numbers such that A is greater than or equal to B, then we can define the difference A-B as the total number of objects we will have if we start with A objects and take away B of those objects.
BUT WHAT DOES THIS MEAN?!?!?!?!?!?!?!?!
Slide26Who likes toys?
Slide27Toy example problem
You bring 4 toys to school. You let one of your friends borrow 1 toy. How many toys do you have left to play with?
Slide28How many toys did you bring to school?
4
toys
Slide29How many toys did you let your friend borrow?
1
toy
Slide30How many toys do you have left?
Toy you gave to your friend
Slide31How many toys do you have left?
1
2
3
You have 3 toys left!!!!!!!
Slide32What did we just do?
We subtracted!!!!
You start with 4 toys and then you give 1 toy to your friend
4 toys
-
1 toy
=
3 toys
Slide33Do you get it?
Try these examples on your own use the toy problem to help you
Slide34You are going to the library to get some books. You get 5 books. When you get home your sister asks you if she can read some of your books. You give your sister 2 books. How many books do you have to read now?
Slide35How many books did you get at the library?
1
2
3
4
5
5 books
Slide36How many books did you give your sister?
1
2
2 books
Slide37How many books do you have left?
Books you give your sister
Slide38How many books do you have left?
1
2
3
3 books
Slide39What did we just do?
You start with 5 books and you gave 2 to your sister
-
=
5 books
2 books
3 books
We subtracted!!!!
Slide40You have 10 jelly beans. You want to share your jelly beans with your friend. You give your friend 6 jelly beans. How many jelly beans do you have left to eat?
Slide41How many jelly beans did you start with?
1
2
3
4
5
6
7
8
9
10
10 jelly beans!!!
Slide42How many jelly beans did you give to your sister
6 jelly beans
1
2
3
4
5
6
Slide43How many jelly beans do you have left?
6 Jelly beans you gave your friend
Slide44How many jelly beans do you have left?
1
2
3
4
4 jelly beans
Slide45What did we just do?
10 jelly beans
6 jelly beans
-
=
4 jelly beans!!!
We subtracted!!!
Slide46Visit our class website for additional adding and subtracting resources
Click the candy bar to get back to our class website!