Transcript K_MA_NS_2.1_SUBTRACT_VARIATION_2_DW

Learning Objective
Today, we will subtract numbers.
Name_____________________
CFU
What are we going to do today?
Activate (or provide) Prior Knowledge
A. If I eat 2 apples, how many are left?
3
B. If you eat 1 orange, how many are left?
2
CFU
Students, you already know that when objects are eaten, we take them away. This is called subtracting.
Today, we will subtract numbers.
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Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Concept Development
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
=
minus sign
equals sign
To subtract numbers, take away, then count the objects1 left.
1 something
you can touch, hold, or see
Subtract Numbers
3
oranges
- 1 = 2
eaten
oranges left
CFU
On your whiteboards, draw the minus sign.
On your whiteboards, draw the equals sign.
In your own words, how do you subtract numbers?
To subtract numbers __________.
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©2012 All rights reserved.
Comments? [email protected]
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
1
1
minus sign
equals sign
2
3 - 1
2
=
=
1
2 - 1
CFU
(#2) How did I/you subtract the numbers?
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(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice (continued)
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
3
minus sign
equals sign
1
3 - 2
4
=
1
=
2
4 - 2
CFU
(#2) How did I/you subtract the numbers?
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Relevance
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
1. Subtracting numbers will help you find out how many
objects or things you have left.
I have 3 marbles. If I give 1 marble to my
sister, how many marbles will I have left?
3
marbles
-
1
marble
=
2
marbles
left
CFU
Does anyone else have another reason why it is relevant to subtract numbers? (pair-share) Why is it relevant to subtract numbers? You
may give me one of my reasons or one of your own. Which reason is more relevant to you? Why?
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
=
Skill Closure
Subtract numbers.
minus sign
equals sign
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
1
2
1
4
Constructed Response Closure
3
-
1
=
Describe2 how you would subtract the numbers below.
2 tell
(pair-share)
about
3
-
1
=
Summary Closure
What did you learn today about subtracting numbers? (pair-share)
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Independent Practice
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
1
minus sign
equals sign
1
2 - 1
2
=
1
=
2
4 - 2
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Independent Practice (continued)
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
=
minus sign
equals sign
3
1
2
3
5 - 2
4
1
2
3
4
5 - 1
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
=
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Periodic Review 1
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
1
-
4
1
equals sign
4
1
4
3
minus sign
=
1
5
2
=
5
-
2
-
3
3
1 2 3 4
6
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
-
2
=
=
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Periodic Review 2
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
3
2
-
1
-
2
5
4
equals sign
2
1 2 3 4 5
7
3
minus sign
=
1
1
=
2
3
-
2
1
3
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
-
2
=
=
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Periodic Review 3
To subtract means to take away.
• The minus sign (+) tells us to subtract.
• The equal sign (=) means the same as.
Subtract numbers.
Step #1: Read the problem.
Step #2: Subtract the numbers. Hint: Take away, then count the objects left.
Step #3: Write the answer.
Step #4: Say the problem and the answer. “_____ minus_____ equals ______”
1
1
2
4
2
1
6
3
1
-
4
1
2
6
1
-
4
2
5
DataWORKS Educational Research
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©2012 All rights reserved.
Comments? [email protected]
-
equals sign
1
4 5
2 3
minus sign
=
3
-
=
3
=
=
=
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.
Blank Page
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? [email protected]
Kindergarten Mathematics Number Sense 2.1
Use concrete objects to determine the answers to
addition and subtraction problems
(for two numbers that are each less than 10).
Lesson to be used by EDI-trained teachers only.