Line Graph Worksheets: Graphing - Free Printable

Let’s go step by step using the line graph titled “Caitlin’s Height”.

The x-axis shows age in years: Birth, 2 Years, 4 Years, 6 Years, 8 Years.
The y-axis shows height in inches: from 0 to 60, with marks every 10 inches (but we can estimate between them).

We’ll read the graph carefully for each question.

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Question 1: How tall was Caitlin when she was 4 years old?

Look at “4 Years” on the bottom axis. Go straight up to the dot on the line. Then look left to see the height.

At 4 years, the dot is halfway between 30 and 40 — so that’s 35 inches.

✔ Answer for #1: 35

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Question 2: How much had Caitlin grown from the time she was born to 6 years old?

First, find her height at birth: The first dot is at about 15 inches.

Then, find her height at 6 years: The dot above “6 Years” is at 45 inches.

Now subtract: 45 - 15 = 30 inches

✔ Answer for #2: 30

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Question 3: How old was Caitlin when she was 30 inches tall?

Find 30 on the vertical axis (height). Move right until you hit the line. Then drop down to see the age.

The line hits 30 inches exactly at 2 Years.

✔ Answer for #3: 2

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Question 4: How tall might Caitlin be when she is 10 years old?

This is a prediction. Look at the pattern:

- At 8 years → 55 inches
- From 6 to 8 years: grew 10 inches (45 → 55)
- So maybe she grows about 5 inches per year? Or less?

But let’s check the growth rate:

Birth (0 yrs): 15
2 yrs: 30 → +15 in 2 yrs → 7.5/yr
4 yrs: 35 → +5 in 2 yrs → 2.5/yr
6 yrs: 45 → +10 in 2 yrs → 5/yr
8 yrs: 55 → +10 in 2 yrs → 5/yr

So recent growth is about 5 inches every 2 years → 2.5 inches per year.

From 8 to 10 years: add 5 inches → 55 + 5 = 60 inches

Looking at the options:

a. 85 — too high
b. 55 — same as 8 years, not growing? No
c. 60 — matches our prediction
d. 65 — possible if growth speeds up, but trend suggests slower or steady

Best guess based on current trend: 60 inches

✔ Answer for #4: c. 60 inches

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Question 5: About how tall might Caitlin have been when she was 5 years old?

She wasn’t measured at 5, only at 4 and 6.

At 4 years: 35 inches
At 6 years: 45 inches

So over 2 years, she grew 10 inches → about 5 inches per year.

So at 5 years (halfway), she’d be halfway between 35 and 45 → 40 inches

Check options:

a. 40 — perfect
b. 43 — too high
c. 49 — way too high
d. 47 — also too high

✔ Answer for #5: a. 40 inches

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Final Answer:
1. 35
2. 30
3. 2
4. c. 60 inches
5. a. 40 inches