Students will learn how to use number lines to solve word problems involving addition and subtraction within 100.

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Add and subtract on the number line word problems by Khan Academy

Conclude by leading this investigation:

Termite Terrorists (addition, patterns)

by MathPickle

2.MD.B.6: Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.