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## Decimal Addition & Subtraction Like You’ve Never Seen

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**Decimal Addition & Subtraction Like You’ve Never Seen**• Pamela Weber Harris • @pwharris • pamelawharris.com • pharris@byu.net**Next Session:Friday 8:00 Decimal Multiplication &**Division3:00 Percents**Counting**Additive Multiplicative Proportional Reasoning Algebraic Reasoning**Problem Strings**• Build Strategies while building Place-Value**Younger Students**• Build Additive Thinking**Problem**Strings 49 + 1049 + 949 + 4049 + 393.8 + 13.8 + 0.93.8 + 53.8 + 4.97.27 + 27.27 + 1.996.6 + 2.96**Problem**Strings Over Strategy 49 + 1049 + 949 + 4049 + 393.8 + 13.8 + 0.93.8 + 53.8 + 4.97.27 + 27.27 + 1.996.6 + 2.96**Counting**Additive Multiplicative Proportional Reasoning Algebraic Reasoning**Problem**Strings 99 + 199 + 2799 + 689.9 + 0.19.9 + 3.74.98 + 0.024.98 + 2.636.74 + 1.2556.97 + 38.98**Problem**Strings Give & Take 99 + 199 + 2799 + 689.9 + 0.19.9 + 3.74.98 + 0.024.98 + 2.636.74 + 1.2556.97 + 38.98**Problem**Strings 53 - 4831 - 47.2 - 6.95.3 - 0.556.11 - 0.2248.03 - 47.99**53 - 4831 - 47.2 - 6.95.3 - 0.556.11 - 0.2248.03 - 47.99**Problem Strings Difference versus Removal**Problem**Strings 6.5 - 2.96.2 - 2.67.1 - 3.56.3 - 2.76.6 - 3.07.6 - 4.013.2 - 9.6**Problem**Strings Constant Difference 6.5 - 2.96.2 - 2.67.1 - 3.56.3 - 2.76.6 - 3.07.6 - 4.013.2 - 9.6**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 8:00 Decimal Multiplication &**Division3:00 Percents**Decimal Addition & Subtraction Like You’ve Never Seen**• Pamela Weber Harris • @pwharris • pamelawharris.com • pharris@byu.net