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Decimal Addition & Subtraction Like You’ve
Never SeenPamela Weber Harris
@pwharrispamelawharris.com
Next Session:Friday 8:00Decimal Multiplication & Division3:00 Percents
Math is figure-out-
able!
Counting
Additive
Multiplicative
Proportional Reasoning
Algebraic Reasoning
Problem Strings
Build Strategies while building Place-Value
Younger Students
Build Additive Thinking
49 + 1049 + 9
49 + 4049 + 393.8 + 1
3.8 + 0.93.8 + 5
3.8 + 4.97.27 + 2
7.27 + 1.996.6 + 2.96
Problem
Strings
49 + 1049 + 9
49 + 4049 + 393.8 + 1
3.8 + 0.93.8 + 5
3.8 + 4.97.27 + 2
7.27 + 1.996.6 + 2.96
Problem
Strings
OverStrateg
y
Counting
Additive
Multiplicative
Proportional Reasoning
Algebraic Reasoning
99 + 199 + 2799 + 689.9 + 0.19.9 + 3.7
4.98 + 0.024.98 + 2.636.74 + 1.25
56.97 + 38.98
Problem
Strings
99 + 199 + 2799 + 689.9 + 0.19.9 + 3.7
4.98 + 0.024.98 + 2.636.74 + 1.25
56.97 + 38.98
Problem
Strings
Give &Take
Not just about any way to do a problem......
The Landscape of Learning
53 - 4831 - 4
7.2 - 6.95.3 - 0.5
56.11 - 0.2248.03 - 47.99
Problem
Strings
ProblemStrings
Difference
versusRemova
l
53 - 4831 - 47.2 - 6.95.3 - 0.556.11 - 0.2248.03 -
47.99
6.5 - 2.96.2 - 2.67.1 - 3.56.3 - 2.76.6 - 3.07.6 - 4.0
13.2 - 9.6
Problem
Strings
6.5 - 2.96.2 - 2.67.1 - 3.56.3 - 2.76.6 - 3.07.6 - 4.0
13.2 - 9.6
ProblemStrings
Constant
Difference
Connections to Higher Math
Counting
Additive
Multiplicative
Proportional Reasoning
Algebraic Reasoning
Math is Figure-out-able
•Look to most efficient strategies
•Teachers build own numeracy
•It’s about relationships:
- Among numbers to solve problems
- Between teachers and students to build young mathematicians
Next Session:Friday 8:00Decimal Multiplication & Division3:00 Percents
Decimal Addition & Subtraction Like You’ve
Never SeenPamela Weber Harris
@pwharrispamelawharris.com
