feb. 2019 z nurturing mathematicians through conceptual ... · z why is math important? almost 90%...
TRANSCRIPT
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Nurturing Mathematicians
Through Conceptual Understanding
Feb. 2019
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Why is Math Important?
Almost 90% of all new jobs
require math beyond high
school level (advanced math)
Preparing students for jobs of
the future- do not exist today
Teaches ways of thinking that
are essential to work and
civic life
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Key Shifts in Math
• Teach less, learn more
• International comparisonsFocus
• Progression across grades
• Foundational skills for the learning of algebra
Coherence
• Conceptual understanding
• Procedural knowledge and fluency
• Problem solvingRigor
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Standards of Mathematical Practice
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Fluency- Place Value and Properties of Operations
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x 1 2 3 4 5 6 7 8 9 10
1 1 2 3 4 5 6 7 8 9 10
2 2 4 6 8 10 12 14 16 18 20
3 3 6 9 12 15 18 21 24 27 30
4 4 8 12 16 20 24 28 32 36 40
5 5 10 15 20 25 30 35 40 45 50
6 6 12 18 24 30 36 42 48 54 60
7 7 14 21 28 35 42 49 56 63 70
What do you notice about the numbers in each row?
How are they related to the circled number? Why?
Can you find other numbers that are related?
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x 1 2 3 4 5 6 7 8 9 10
1 1 2 3 4 5 6 7 8 9 10
2 2 4 6 8 10 12 14 16 18 20
3 3 6 9 12 15 18 21 24 27 30
4 4 8 12 16 20 24 28 32 36 40
5 5 10 15 20 25 30 35 40 45 50
6 6 12 18 24 30 36 42 48 54 60
7 7 14 21 28 35 42 49 56 63 70
2 + 6 = 8
(2 x 1) + ( 2 x 3) = 2 x 4
12 + 24 = 36
( 4 x 3) + (4 x 6) = 4 x 9
Can you find others?
Distributive Property
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16 x 25 = 400
16 20
20 25
20 x 20 = 400
Why?
Does it work for every box of
four numbers?
4 x 4
5 x 5
4 x 5 x 4 x 5
4 x 4 x 5 x 54 x 5
4 x 5
16 x 25 = 20 x 20
(4 x 4) x (5 x 5) = (4 x 5) x (4 x 5)
Commutative and Associative Properties
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Let’s do some thinking:
17 + 39 + 23 + 11
17 + 23 + 39 + 11
40 + 50
90
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Let’s do some thinking:
18 + 18 + 18 + 18 + 18
20 + 20 + 20 + 20 + 20 = 100
2 + 2 + 2 + 2 + 2 =10
100 – 10 = 90
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Let’s do some thinking:
1
2x 8
1
2
1
2x ( 8 +
1
2)
(1
2x 8) + (
1
2x 1
2)
4 + 1
4
41
4
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Let’s do some thinking:
6 1
3÷1
3
How many 1
3s are in 1?
How many 1
3s are in 6?
3 x 6 = 18
18 plus one more third is 19
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zMoney: fourths (25¢), halves (50¢), tenths
(10¢), twentieths (5¢), and hundredths (1¢)
𝟑
𝟒+ 𝟑
𝟒3𝟏
𝟒-𝟏
𝟐
𝟏
𝟏𝟎+ 𝟏
𝟒
𝟏
𝟒+
𝟏
𝟐𝟎4
𝟏
𝟐+ 2
𝟑
𝟒5 -
𝟕
𝟏𝟎
Fractions– Addition/Subtraction
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zClock: halves (30 min.), thirds (20 min.),
fourths (15 min.), sixths (10 min.), twelfths (5
min.)
𝟑
𝟒-𝟏
𝟐
𝟏
𝟔+ 𝟏
𝟔
𝟏
𝟏𝟐+
𝟏
𝟏𝟐+
𝟏
𝟏𝟐
𝟏
𝟐+ 𝟏
𝟔
𝟐
𝟑+
𝟏
𝟏𝟐
𝟑
𝟒-𝟏
𝟏𝟐
Fractions– Addition/Subtraction
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How Can Parents Support
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Resources for Parents
New Common Core State Standards for Mathematics
www.corestandards.org
National PTA Resources www.pta.org (Parent Guides
to Student Success)
Kahn Academy: www.khanacademy.org
Smarter Balanced: www.smarterbalanced.org
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