number sense building a solid foundation · • develops an understanding of the part-part-whole...
TRANSCRIPT
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Number SenseBuilding a Solid Foundation
Sandra BallMarch 2015
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www.startingwiththebeginning.wordpress.com
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Learning Intentions
I understand the plasticity of the brain and how it affects learning.
I recognize the importance of using ten frames in developing number sense.
I recognize the importance of ‘Number Talks’.
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Using your mini ten frames, think of different ways to make …
170
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Today’s mathematics classrooms should be ...dynamic places where children are involved and engaged in their own learning,include activities that promote higher level thinking, cooperative problem solving and communication.
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• number sense• subitizing, partitioning and patterning
• student confidence • the passion and joy for mathematics• an understanding that mathematics is about making meaning• thinking skills• problem solving strategies
Our classrooms should focus on developing …
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One Size Does Not Fit All!
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Who are our learners?
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What does it mean to have good number sense?
What does it look like? Sound like?
How do you know people have good number sense?
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“Number sense is a person's general understanding of number and operations along with the ability to use this understanding in flexible ways to make mathematical judgements and to develop useful strategies for solving complex problems.”
Burton, 1993; Reys, 1991
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Numerically Powerful Students can...
• Develop meaning from numbers
• Look for relationships
• Understand and correctly use computational
• strategies
• Make sense of numerical situations
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“Students with a strong number sense can think and reason
flexibility with numbers, use numbers to solve problems, spot
unreasonable answers, understand how numbers can be
taken apart and put together in different ways, see
connections among operations, figure mentally, and make
reasonable estimates.”
Marilyn Burns
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• Visual tools can be concrete, pictorial or virtual.
• Visual tools such as concrete materials…
• dot cards• five and ten frames• hundreds grids• number lines
…can lead to students being able to visualize these tools and scaffold
their thinking towards mental mathematics and abstraction.
What are Visual Tools?
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• Students need a strong foundation with concrete and pictorial experiences and representations before moving to more abstract mathematics.
• Create various learning opportunities for students to think about number in different ways and representations.
• Nurturing both flexibility and fluency in working with numbers.
• Students need strong number sense (flexibility and fluency) in order to have computational fluency.
Why Use Visual Tools?
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“The brain is a superb pattern seeker, and we want to take advantage of this capability by getting students to form mental images of number patterns. If students just use manipulatives, they are more likely to rely on counting by ones rather than on mental imagery.”
(Kline, 1998)
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concretely
The Teaching – Learning Journey
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• Direct Instruction
Before - During – After
• Guided practicePromote mastery & continued exploration
• Independent practice
Practicing and mastering the strategy
Thinking about meaning
Communicating ideas
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Counting tells how many things are in a set.
Numbers are related to each other.
Number concepts are intimately tied to the real world.
Multiplication involves the counting of groups.
Subitizing numbers is important.
Addition and Subtraction are related.
Multiplication and division are related.
Big Ideas of Number Sense
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Subitizing Strategies
• Recognizing sets of objects at a glance without counting
• Making the leap from counting to recognizing a group as a whole
• Visualizing quantities –“Take a picture like a camera”
• Subitizing dot cards is like recognizing sight words
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• encourages reflective thinking about patterns so that the relationships between numbers can be constructed
• aids in ‘counting on’ from a known patterned set
• develops an understanding of the part-part-whole model
• develops an understanding of how different arrangements leads to different decompositions of that number
Subitizing and Visualization
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Partitioning
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• breaking a set into parts and putting it back together again.
• building an understanding of addition and subtraction
• allowing students to explore and understand ‘why’ fact families exist
Partitioning
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“ To conceptualize a number as being made up of two or more parts is the most important relationship that can be developed about numbers. For example, 7 can be thought of as a set of 3 and a set of 4 or a set of 2 and a set of 5.”
John Van de Walle, 2014
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Part Part
Whole
Addition and Subtraction
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• Begin with 5 frames (Kindergarten) then move to 10
frames
• Build quantities
• Compare quantities
• Establish five or ten as a unit (benchmark)
• Develop understanding of part-part-whole model
• Develop understanding of addition and subtraction
• Develop an understanding of place value
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• 5 and 10 frames become an “anchor”
• Provides a visual tool
• Develops whole/part/part concept
• Builds understanding of the concept of ten being a unit
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• Begin with 5 frames (Kindergarten) then move to 10 frames
• Build quantities
• Compare quantities
• Establish five or ten as a unit (benchmark)
• Develop understanding of part-part-whole model
• Develop understanding of addition and subtraction
• Develop an understanding of place value
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5
7
5 is 2 less
than 7
7 is 2 more
than 5
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Rules:
1. Each player chooses a
colour of counters.
2. Players take turns finding
2 sets of dots that total 10.
3. When all the spaces are
covered…the one with the
longest line wins.
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8 + 9 = 17
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17 – 9 = 8
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17 – 9 = 8
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46 + 38 = 84
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84 – 46 = 38
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Number SenseBuilding a Solid Foundation
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Number SenseBuilding a Solid Foundation
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TEEN TENT CARDS
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• Roll a 1 – 6 die.
• Add 10 to the number rolled.
• Cover the sum.
• First to 3 in a row wins!
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How many people are on the buses?
How do you know?
10 + 6 = 16
What happens if 6 people get off the second bus?
16 - 6 = 10
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Mathematicians know that 10 is a friendly number and that we can bridge through ten to find the sum.
It is a good idea to compensate (take from one and give to another) when we add 9 or 8.
6 people want to get off the buses.
Can you use the ‘Get to Ten’ strategy.
16 – 10 = 6
What if 7 people want to get off the buses?
16 - 7 = 9
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15 – 5 = 10
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An understanding of how a number can be decomposed facilitates flexible thinking for computational strategies.
“Perhaps the most important strategy for students to know is the Make 10 strategy, or combinations that make ten.
… can be solved by using the Up Over Ten strategy. That makes this the most useful strategy…”
John Van deWalle
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• Mental math problems are posed• Students thinking about the problem• Students share solutions and explain
thinking• Students are encouraged to
communicate• Teacher acts as a facilitator to guide
the discussion
What are Number Talks?
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• Develop Number Sense
• Develop Fluency
• Encourage Strategic Thinking
• Use Various Representations
Why Number Talks?
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3 Goals
• Accuracy - ability to produce an accurate solution
• Efficiency - ability to choose an appropriate and
expedient strategy
• Flexibility - ability to use number relationships
• with ease
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Process NOT Product
• Students need to justify answers
• Students have a sense of shared responsibility
• Wrong answers are seen as learning
opportunities
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Hand SignalsI have a answerI agreeI have another strategyI disagree
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Big Results in a Small
Amount of Time
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The Teacher’s Role
• listen to what the students say
• watch what they do
• ask questions
• respond carefully
• provide time talk
• allow students to struggle
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• How do you know . . . ?• Tell me what you are thinking . . . • What do you see in your head . . . ?• Show me what you know . . . • Tell me what you know . . . • How did you do that . . . ?• What did you notice . . . ?• What questions did you ask yourself . . . ?• If you were going to tell someone else what you did . . ?• What was your strategy . . . ?• How did you start . . . ?• Close your eyes. What do you see . . . ?• What do you think the problem is . . . ?• Why do you think ____ . . . ?
Questions to extend thinking …
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“Fluency is knowing how a number can be
composed and decomposed and using that
information to be flexible and efficient with solving
problems.”
Parrish, 2010
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What are the greatest hopes for our students...
• Take ownership for their learning
• Are risk takers and accept challenges
• View wrong answers as part of a journey
• See themselves as confident mathematicians
• Self-regulate
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