Transcript Learning How to Add and Subtract!

WHAT 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
WHO LIKES CANDY?
WHAT IS YOUR
FAVORITE KIND?
CANDY 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?
HOW MANY RECCES PIECES DID YOUR
TEACHER GIVE YOU?
2pieces
HOW MANY MORE RECCES PIECES DID YOUR
FRIEND GIVE YOU AT LUNCH
1Piece
HOW 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?
HOW MANY TOTAL RECESS PIECES DO YOU
HAVE?
1
2
3
3 recess pieces
total
USING NUMBERS!
2
+ 1= 3
DO YOU GET IT?
TRY THESE
EXAMPLES ON YOUR
OWN USE THE CANDY
PROBLEM TO HELP
YOU
YOUR MOM GIVES YOU 5
VANILLA CUPCAKES AND 5
CHOCOLATE CUPCAKES TO
SHARE WITH YOUR
FRIENDS. HOW MANY
CUPCAKES DID YOUR MOM
GIVE YOU?
HOW MANY VANILLA CUPCAKES DID YOUR
MOM GIVE YOU?
5 vanilla cupcakes
HOW MANY CHOCOLATE CUPCAKES DID YOU
MOM GIVE YOU?
5 chocolate cupcakes
HOW MANY CUPCAKES DID YOUR MOTHER GIVE
YOU TO SHARE WITH YOUR FRIENDS?
COUNT THE CUPCAKES!
COUNT THE CUPCAKES
1
2
3
4
5
6
7
8
9
10
10 cupcakes to share
WHAT DID WE JUST DO?
5 vanilla cupcakes
+
= 10 cupcakes!!!!
5 chocolate cupcakes
WE ADDED!
YOU 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?
HOW MUCH SUGAR DOES ONE CAKE RECIPE
REQUIRE?
1
2
HOW MUCH SUGAR WILL TWO CAKE RECIPES
REQUIRE?
Count the number of cups!
HOW MUCH SUGAR WILL TWO CAKE RECIPES
REQUIRE?
1
2
3
4
Count the number of cups!
WHAT DID WE JUST DO?
2 cups = 1 cake
+
2 cups = 1 cake
=
?
4 CUPS OF SUGAR!
WHAT IS SUBTRACTION?
Definition: If A and B are nonnegative 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.
WHO LIKES TOYS?
TOY 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?
4toys
HOW MANY TOYS DID YOU BRING TO SCHOOL?
HOW MANY TOYS DID YOU LET YOUR FRIEND
BORROW?
1toy
HOW MANY TOYS DO YOU HAVE LEFT?
Toy you gave to your friend
HOW MANY TOYS DO YOU HAVE LEFT?
1
2
3
You have 3 toys left!!!!!!!
WHAT DID WE JUST DO?
You start with 4 toys and then you give 1 toy to your friend
-
4 toys
1 toy
=
3 toys
We subtracted!!!!
DO YOU GET IT?
TRY THESE
EXAMPLES ON YOUR
OWN USE THE TOY
PROBLEM TO HELP
YOU
YOU 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?
HOW MANY BOOKS DID YOU GET AT THE
LIBRARY?
1
2
3
4
5 books
5
HOW MANY BOOKS DID YOU GIVE YOUR
SISTER?
1
2
2 books
HOW MANY BOOKS DO YOU HAVE LEFT?
Books you give your sister
HOW MANY BOOKS DO YOU HAVE LEFT?
1
2
3
3 books
WHAT DID WE JUST DO?
You start with 5 books and you gave 2 to your sister
5 books
=
2 books
3 books
We subtracted!!!!
YOU 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?
HOW MANY JELLY BEANS DID YOU START
WITH?
1
2
3
4
5
6
7
8
9
10
10 jelly beans!!!
HOW MANY JELLY BEANS DID YOU GIVE TO
YOUR SISTER
1
2
3
4
5
6
6 jelly beans
HOW MANY JELLY BEANS DO YOU HAVE LEFT?
6 Jelly beans you gave your friend
HOW MANY JELLY BEANS DO YOU HAVE LEFT?
1
2
3
4
4 jelly beans
WHAT DID WE JUST DO?
=
10 jelly beans
6 jelly beans
4 jelly beans!!!
We subtracted!!!
VISIT OUR CLASS
WEBSITE FOR
ADDITIONAL ADDING
AND SUBTRACTING
RESOURCES
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