3rd grade measuring length worksheets

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Third grade measuring length worksheets move to halves and quarter inches. Each item shows a bar above a ruler, and some bars start at a nonzero tick, so an answer like 3 1/2 in takes careful reading, not a glance at the last mark.

Free printable PDF worksheet, aligned to Common Core 3.MD.B.4.

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The kind of problems you'll get

Use the pictured ruler to find each bar’s length. The pictures are not actual-size rulers.

  1. A bar runs from 0 cm to 5 cm. How long is it?

    Answer: 5 cm.

Most problems on this sheet sit beside a picture, model or diagram, so this is the worked example the sheet itself prints. The answer key on page two prints the answer under every problem.

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on a 3rd grade sheet

The sample sheet above has 8 problems. The 2nd grade sample has 6. This sheet is aligned to 3.MD.B.4. The 2nd grade sheet is aligned to 2.MD.A.1.

Every version prints on US Letter or A4, with its answer key after the problems.

How to teach this

When a bar starts at 2 and ends at 6, ask "how far did it travel?" instead of "where did it stop?" That one question fixes most wrong answers. For the fraction marks, count the small spaces out loud: two little jumps past 3 is 3 2/4, which is 3 1/2. Keeping a real ruler on the table makes the printed one feel familiar.

Watch for: Kids count the tick marks instead of reading the number at the end. The length is the number where the bar stops, not how many lines it crosses. Kids read the end tick even when the bar starts at a nonzero mark. Count the span from start to end, or subtract the start number from the end number.

Common questions about 3rd grade measuring length

How is this harder than the second grade version?
Two ways: the ruler now shows half and quarter inches, and some bars start at a nonzero mark, so your child measures the span instead of just reading the last number.
How should fraction answers be written?
As a whole number with a fraction and the unit, like 3 1/2 in. The answer key uses simplest form, so a bar ending two quarter-marks past 2 is 2 1/2 in.

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Aligned to Common Core 3.MD.B.4. Reviewed by the One more sheet team. Content version 241, updated September 2026.

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