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Decimal Addition & Subtraction Like You’ve Never Seen

Join Pamela Weber Harris in an engaging session that revolutionizes how you approach decimal addition and subtraction. Discover effective strategies for teaching young students how to understand and manipulate numbers through problem strings that emphasize additive, multiplicative, and proportional reasoning. Our next session also covers decimal multiplication and division as well as percents. Learn how to build mathematical relationships among numbers, and foster a culture of problem-solving in your classroom.

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Decimal Addition & Subtraction Like You’ve Never Seen

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  1. Decimal Addition & Subtraction Like You’ve Never Seen • Pamela Weber Harris • @pwharris • pamelawharris.com • pharris@byu.net

  2. Next Session:Friday 8:00 Decimal Multiplication & Division3:00 Percents

  3. Math is figure-out-able!

  4. Counting Additive Multiplicative Proportional Reasoning Algebraic Reasoning

  5. Problem Strings • Build Strategies while building Place-Value

  6. Younger Students • Build Additive Thinking

  7. 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

  8. 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

  9. Counting Additive Multiplicative Proportional Reasoning Algebraic Reasoning

  10. Problem Strings 99 + 199 + 2799 + 689.9 + 0.19.9 + 3.74.98 + 0.024.98 + 2.636.74 + 1.2556.97 + 38.98

  11. 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

  12. Not just about any way to do a problem......

  13. The Landscape of Learning

  14. Problem Strings 53 - 4831 - 47.2 - 6.95.3 - 0.556.11 - 0.2248.03 - 47.99

  15. 53 - 4831 - 47.2 - 6.95.3 - 0.556.11 - 0.2248.03 - 47.99 Problem Strings Difference versus Removal

  16. Problem Strings 6.5 - 2.96.2 - 2.67.1 - 3.56.3 - 2.76.6 - 3.07.6 - 4.013.2 - 9.6

  17. 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

  18. Connections to Higher Math

  19. Counting Additive Multiplicative Proportional Reasoning Algebraic Reasoning

  20. 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

  21. Next Session:Friday 8:00 Decimal Multiplication & Division3:00 Percents

  22. Decimal Addition & Subtraction Like You’ve Never Seen • Pamela Weber Harris • @pwharris • pamelawharris.com • pharris@byu.net

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