Grade 6 Math: Dot Plots

Grade 6 focus: A dot plot (number line plot) shows each data value as a dot above a number line. Repeated values stack vertically. Dot plots make shape, center, and spread easy to see for small to medium data sets.

Video lesson: Watch this Math with Mr. J tutorial on how to make and read a dot plot.

How to build one

1. Draw a number line that covers the data range.
2. For each value, place a dot above its position.
3. If a value repeats, stack dots.
4. Title the display and label the axis with units if applicable.

What to look for

• Clusters—where data pile up.
• Gaps—regions with no data.
• Outliers—values separated from the main cluster (informal language in Grade 6).

Dot plot vs. histogram

Dot plots show every value; histograms group values into bins. Dot plots work well when you want to preserve individual data points.

Common mistakes

• Using uneven spacing on the number line.
• Forgetting to stack dots for duplicates.
• Choosing a range that cuts off important values.

Fluency check

Given heights of plants in inches, plot each height on a dot plot and describe one feature of the distribution in a sentence.