Line Plots — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
To count students with 2 pets in Grade 3, add the Xs on every number.
Corrected: To count students with 2 pets in Grade 3, count only the Xs above 2.
To find how many students had a specific value, you only count the Xs in the column above that one number.
2. Fix the sentence:
If 5 Xs are above 3 books in a Grade 3 line plot, then 3 students read books.
Corrected: If 5 Xs are above 3 books in a Grade 3 line plot, then 5 students read 3 books.
Each X stands for one student, and the number on the scale shows how many books that student read.
3. Fix the sentence:
A Grade 3 line plot of siblings shows the same student more than once.
Corrected: A Grade 3 line plot of siblings shows each student only once.
Every student contributes exactly one X to a survey line plot, so no student is counted twice.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A Grade 3 line plot has 4 Xs above 1 pet, so 4 students have 1 pet.
Each X equals one student, so 4 Xs above the value 1 means 4 students reported having 1 pet.
2. On a Grade 3 books-read line plot, 0 Xs above 5 books means 0 students read 5 books.
When a column on the scale has no Xs, the count is zero, so no student fell into that category.
3. If a Grade 3 line plot shows 2 Xs above 0 siblings, 2 students have no siblings.
Two Xs above the value 0 means two students answered that they have zero siblings.
4. On a Grade 3 line plot, the column above 4 has the tallest stack, so 4 is the most common value.
The most common value has the tallest stack of Xs because that measurement happened more often than any other.
Part C: True or False?
Read each statement. Circle True or False.
1. A Grade 3 line plot of pets with 3 Xs above 0 means 3 students have no pets.
True False
Each X above 0 represents one student whose pet count was zero, so 3 Xs means 3 students had no pets.
2. On a Grade 3 line plot, you should count Xs by adding the numbers below them.
True False
You count the Xs themselves to find frequency. The scale numbers tell you what value each column represents, not the count.
3. If a Grade 3 line plot has 6 total Xs, then 6 students were surveyed.
True False
Each student contributes exactly one X, so the total number of Xs equals the total number of students surveyed.