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## Negative Numbers

###### Third Grade Lessons

**Multiple Number Lines** - Students continue to learn that two partial changes that start at different points on the number line are equivalent. At the end, they will work with notation for variables (N + 5 - 3 or N + 2).
**N-Number Line I** - Students work with the table they built in the previous class for multiple number lines, focusing on the notation for variables (N + 5 - 3 or N + 2).
**Number Line - Locations** - Students place themselves at points on the number line. Main contexts: stairs, age, money, temperature, and pure number.
**Number Line Shortcuts** - The students will use a number line to see how two addends or subtrahends are equivalent to one single change once combined.
**Partial and Total Changes** - Students learn that two partial changes are equivalent to a single total change. On the number line, this corresponds to the idea of a shortcut. Three notations are emphasized: words, number lines with hopping arrows, and numerical expressions.

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