Line Plots and Scaled Graphs Quiz

Grade 3 · Math · Quiz

Test your ability to read, interpret, and reason about line plots and scaled bar and picture graphs.

Questions

A bar graph has a scale where each grid line = 10. A bar reaches 4 grid lines high. What value does it show?
1. 4
2. 14
3. 40
4. 44
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Answer: 40
4 grid lines × 10 per line = 40. Always multiply bar height by the scale value.
A picture graph key says each sun = 5 sunny days. One month shows 6 suns. How many sunny days?
1. 6
2. 11
3. 25
4. 30
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Answer: 30
6 suns × 5 days each = 30 sunny days.
A line plot shows the lengths of pencils in inches: 5, 5, 6, 6, 6, 7, 8. How many pencils are exactly 6 inches?
1. 1
2. 2
3. 3
4. 4
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Answer: 3
Count the data values of 6: there are three 6s in the set, so 3 Xs above 6.
You should always read the key or scale on a graph before interpreting the data.
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Answer: True
The scale or key tells you what each unit or symbol is worth. Without it, you cannot correctly read the data.
A scaled bar graph shows: Dogs = 3 bars, Cats = 5 bars, Birds = 2 bars. Scale: each bar = 4 pets. How many cats are there?
1. 5
2. 9
3. 20
4. 25
Show answer
Answer: 20
Cats = 5 bars × 4 pets = 20 cats.
On a line plot of test scores: 70 has 2 Xs, 80 has 5 Xs, 90 has 3 Xs. Which score is the mode?
1. 70
2. 80
3. 90
4. They are all the same
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Answer: 80
80 has the most Xs (5), so it is the mode — the most frequently occurring score.
A pictograph key says each book symbol = 3 books. A student's row shows 5 book symbols. The student read ___ books.
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Answer: 15
5 book symbols × 3 books each = 15 books.
A line plot shows plant heights in cm: 2, 3, 3, 4, 4, 4, 5. What is the total height of all plants added together?
1. 20
2. 25
3. 27
4. 28
Show answer
Answer: 25
2 + 3 + 3 + 4 + 4 + 4 + 5 = 25 cm total.

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