First, students will learn how to add and subtract integers using a number line.

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Next, students will learn how to label a tick mark on a number line, given two other labelled tick marks. To do this, they'll start by identifying the gap between the two labelled tick marks. From this, students will be able to determine the distance between any two tick marks. Then students can skip-count forward or backward from one of the labelled tick marks, to the unlabelled tick mark, and thus determine its label.

Missing numbers on the number line examples by Khan Academy

Missing numbers on the number line by Khan Academy

Next, give your students these challenges:

- Yin Yang by NRICH
- Midpoint Triangle by NRICH
- Sorting the Numbers by NRICH

Conclude by leading this investigation:

Cartouche Puzzles (arithmetic)

by MathPickle

6.NS.C.6: Understand a rational number as a point on the number line. Extend number line diagrams and coordinate axes familiar from previous grades to represent points on the line and in the plane with negative number coordinates.