Grade 8 · Math

8th grade Draw a line that fits the dots worksheet

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Draw a line that fits the dots

Grade 8 Math Worksheet

NameDate

Circle the best answer.

1.
Ren plotted minutes of study against quiz scores for eight classmates. Four ruler lines are drawn. Which line fits the dots best?
- Line B, through (20, 62) and (90, 91.5)
- Line D, through (20, 65) and (50, 73)
- Line C, through (20, 65) and (90, 93)
- Line A, through (20, 74) and (90, 78)
2.
Tala's class measured arm spans and heights. Everyone stretched out like a starfish. Which of the four ruler lines fits the dots best?
- Line A, through (140, 145) and (175, 180)
- Line B, through (140, 154) and (175, 165)
- Line C, through (155, 156) and (160, 163)
- Line D, through (140, 142) and (175, 178.5)
3.
Zee logged eight dog walks: minutes walked and blocks covered. The dog stopped to sniff everything. Which of the four ruler lines fits the dots best?
- Line A, through (15, 13) and (30, 19)
- Line B, through (15, 13) and (50, 34)
- Line D, through (15, 19) and (50, 25)
- Line C, through (15, 11.5) and (50, 32.5)
4.
Ari timed ice cube trays left in the sun and weighed the melted water. Which of the four ruler lines fits the dots best?
- Line C, through (10, 28) and (15, 41)
- Line D, through (5, 24) and (40, 94)
- Line B, through (5, 42) and (40, 66)
- Line A, through (5, 20.5) and (40, 91.5)
5.
Jun asked eight classmates about homework time and problems finished, then tried two ruler lines. Each has as many dots above as below. Which line fits better, and why?
- They fit equally well, because each has as many dots above as below.
- Line A, because its dots stay closer to it.
- Line B, because it passes through more dots.
- Line B, because it is steeper.
6.
Kira measured eight potted plants of different ages and drew two ruler lines. Each has as many dots above as below, and one plant leans toward the window. Which line fits better, and why?
- They fit equally well, because each has as many dots above as below.
- Line B, because its dots stay closer to it.
- Line A, because it passes through more dots.
- Line A, because it is steeper.
7.
Luz kept three plots about a growing puppy. For which plot is a straight fit line a good model?
- Plot B, because its dots change steadily from left to right.
- Plot C, because a ruler line can go through the middle of any dots.
- Plot A, because its dots stay near one straight line.
8.
At the winter fair's cocoa stand, Milo made three plots. For which plot is a straight fit line a good model?
- Plot A, because its dots change steadily from left to right.
- Plot B, because its dots stay near one straight line.
- Plot C, because a ruler line can go through the middle of any dots.
9.
Noah's play-ball club made three plots, and one ball rolled under the bleachers. For which plot is a straight fit line a good model?
- Plot C, because its dots stay near one straight line.
- Plot B, because its dots change steadily from left to right.
- Plot A, because a ruler line can go through the middle of any dots.
10.
Pia's class kept three plant plots in the science room. For which plot is a straight fit line a good model?
- Plot C, because its dots change steadily from left to right.
- Plot A, because its dots stay near one straight line.
- Plot B, because a ruler line can go through the middle of any dots.

8th grade Draw a line that fits the dots worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Draw a line that fits the dots. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can tell whether a ruler line fits the dots: about as many dots above it as below, and all of them close.
I can say why the line through the end dots, or through the most dots, is not always the best fit, and let an outlier sit off the line.
I can add up how far the dots are from a line, and say when a straight line is a good model.

Standard: 8.SP.A.2

Words to know

fit line (line of best fit): A straight line through the middle of the dots, close to all of them.

above / below the line: The dot is higher / lower than the line at the same x.

up-or-down distance: How far a dot is straight above or below the line.

outlier: A dot far away from the pattern of the other dots.

model: A line or rule that describes how two amounts tend to change together.

linear / bends: Dots stay near one straight line / dots follow a curve.

Common mistakes

Your child compared the dots with the line correctly but counted the dots on the other side. Read the question's word together, above or below, and point to that side of the line.

Your child counted every dot instead of only the dots on one side of the line. For each dot, ask together: is it higher or lower than the line at that spot?

Your child saw the line needed to move but chose the wrong direction. Count together how many dots are above the line and how many are below, then move the line toward the bigger group.

Questions parents ask

What is the most common mistake with draw a line that fits the dots?

Your child compared the dots with the line correctly but counted the dots on the other side. Read the question's word together, above or below, and point to that side of the line.

Are these 8th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 8 math

See all grade 8 math

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