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1copyright © Creative Smarts Inc. GregTangMath.com
October 21, 2015
GregTangMath.com
NCTM Eastern RegionalAtlantic City, NJ
2copyright © Creative Smarts Inc. GregTangMath.com
What’s the first number that jumps into your head?
4 = – 8
3copyright © Creative Smarts Inc. GregTangMath.com
Forms of Subtraction Equations
12 – 4 = 8
4copyright © Creative Smarts Inc. GregTangMath.com
Forms of Subtraction Equations
12 – 4 = 8
12 – 4 = 8
5copyright © Creative Smarts Inc. GregTangMath.com
Forms of Subtraction Equations
12 – 4 = 8
12 – 4 = 8
12 – 4 = 8
6copyright © Creative Smarts Inc. GregTangMath.com
Forms of Subtraction Equations
12 – 4 = 8
12 – 4 = 8
12 – 4 = 8
4 + 8 = 8
7copyright © Creative Smarts Inc. GregTangMath.com
Part-part-whole
? – 4 = 8
8copyright © Creative Smarts Inc. GregTangMath.com
Part-part-whole
?
? – 4 = 8
9copyright © Creative Smarts Inc. GregTangMath.com
Part-part-whole
?
4
? – 4 = 8
10copyright © Creative Smarts Inc. GregTangMath.com
Part-part-whole
?
4 8
? – 4 = 8
11copyright © Creative Smarts Inc. GregTangMath.com
Part-part-whole
?
4 8
? – 4 = 8
4 + 8 = ?
12copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28
13copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28-4 -4
14copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28-4 -43x = 24
15copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28-4 -43x = 243 3
16copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28-4 -43x = 243 3x = 8
17copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28
18copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28
19copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28
20copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28x = 8
21copyright © Creative Smarts Inc. GregTangMath.com
Solving Algebraic Equations
3x + 4 =28
22copyright © Creative Smarts Inc. GregTangMath.com
Make Sense of Problems!
X + Y = 22
Y + Z = 27
Z + X = 25
23copyright © Creative Smarts Inc. GregTangMath.com
October 21, 2015
GregTangMath.com
NCTM Eastern RegionalAtlantic City, NJ
