Ruler measurement worksheets: measure, draw and compare

Free ruler measurement worksheets that print true to size

A measuring worksheet only works if the lines on the paper really are the length they should be. A segment that should be 3 inches but prints at 2.8 teaches a child that the ruler is wrong. On this page you can print free ruler worksheets with true-size line segments: measure them, draw your own and compare two of them, in whole inches, to the nearest 1/2, 1/4 or 1/8 inch, in whole centimeters or in centimeters and millimeters. Every sheet has a scale check line so you can confirm the size with your own ruler. Print on US Letter or A4 with no sign-up, and keep the answer key for yourself.

Three kinds of problems

• Measure a segment. The child places the ruler on segment AB and writes its length.
• Draw a segment. The child draws a segment of a given length along the dotted guide and labels its ends. This is harder than it looks, because it means starting at the 0, stopping at the right mark and keeping the pencil against the edge.
• Compare two segments. The child measures AB and CD and writes >, < or =. Some pairs differ by very little, and some are exactly equal, so measuring beats guessing by eye.

“A bit of everything” rotates through all three. Choose a single kind when a child is working on one specific skill.

Inches and fractions of an inch

Inch rulers are full of small marks of different lengths, and reading them is a skill of its own. U.S. schools usually build it up in steps, so the worksheets offer the same steps:

• Whole inches. A good start in the early grades. Every line ends exactly on a numbered mark.
• To the nearest 1/2 inch. The first fractions: 2 1/2 in. The child learns to find the mark halfway between two numbers.
• To the nearest 1/4 inch. Lengths such as 1 1/4 in and 3 3/4 in. Usually taught around third grade.
• To the nearest 1/8 inch. Lengths such as 1 3/8 in and 5 7/8 in. Usually taught around fourth grade.

All inch lengths go from 1 to 6 inches, so a standard 6- or 12-inch ruler is enough. Fractions are always written in lowest terms, the way a teacher would expect them: 1 1/2 in, not 1 4/8 in. Each setting includes the coarser marks as well, so on a 1/4-inch sheet you may also meet 2 1/2 in or simply 4 in. That is deliberate, since a child has to read the ruler and not just assume that every answer ends in 1/4.

Centimeters and millimeters

Metric rulers are easier to read, because all the marks count in tens. With “Whole centimeters” the lengths go from 2 to 10 cm. With “Centimeters and millimeters” they go from 1 cm 5 mm to 10 cm 5 mm and are written in two units, such as 5 cm 3 mm, so no decimals are needed. Many American rulers have centimeters along the other edge, so it is easy to try both systems with the same tool.

How to print at the right size

1. In the print dialog choose 100%, “Actual size” or “Scale: 100”. Turn off “Fit to page” and “Shrink to fit”.
2. Pick the paper size you have loaded: Letter or A4. Line lengths are the same on both.
3. Find the scale check at the bottom of the sheet and measure it with your ruler: exactly 2 inches on inch sheets, exactly 5 cm on metric sheets.
4. If the line is off, go back to the print settings before handing out the sheets.

Do not measure on the screen. Screens differ, and the lines will not be true to size until they are on paper.

Teaching a child to use a ruler

Most early mistakes have nothing to do with math. These are the ones to watch for:

• Starting at the end of the ruler instead of at 0. Many rulers have a small gap before the 0, so the instruction at the top of the sheet says to line up the 0 with the start of the segment.
• Starting at 1. A child who lines up the 1 gets an answer that is one unit too long. Ask them to count the spaces between the marks and not the marks themselves.
• A ruler that slips. Hold it with the other hand, fingers spread, and keep the pencil against its edge when drawing.
• Reading the wrong kind of mark. On an inch ruler the longest marks are whole inches, then halves, then quarters. Coloring them on a paper ruler can help.

A simple order of practice

Begin with “Measure a segment” in whole units and four problems per sheet. Move on to drawing, which needs better control of the ruler and the pencil. Comparing comes next and brings measuring together with greater than and less than. Only then add fractions of an inch or millimeters, one step at a time. A short session with a few lines each day works better than a long one, since small hands tire quickly from holding a ruler still.

Worksheets and copies

Choose 4 or 6 problems per sheet. Four leave more room around each line and suit younger children. For a group, set the number of children from 1 to 6: each gets an identical copy, and one answer key goes at the end of the stack. Below the settings you can see how many sheets, rulers and pencils to get ready. You can add a caption of up to 60 characters, such as a name or “Learning to measure”. Press “New problems” for a new set; changing the number of copies or the caption keeps the problems you already have.

Checking the answers

The answer key lists the problems in the same order. For a measuring problem it gives the length, for a comparison it gives both lengths and the sign. For a drawing problem it gives the required length, and the grown-up simply measures the child's line. Hand-drawn lines are rarely perfect, so allow a small difference, about the width of a pencil line. If a measurement is off by exactly one unit, the child most likely started at 1 instead of 0.

More hands-on math

Once children can measure, they can use the numbers. Try measurement conversion worksheets for feet and inches, area and perimeter worksheets, and number line worksheets, since a ruler is really a number line. Fraction worksheets go well with reading inch marks. You can also print true-size graph paper and lined paper for measuring and drawing on your own.

Frequently asked questions

Choose the units and the kind of problems, print at 100%, and get out a ruler.