Measuring with a ruler, yardstick, or tape
In 2nd grade, children learn to measure length with rulers, yardsticks, meter sticks, and measuring tapes; to choose the right tool for the job; and to read it correctly.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
Try these with your child
These are real questions from our 2nd grade practice. Tap the speaker to hear one read aloud, or the light bulb for a hint, and talk about the answer together.
Question 1 of 3
A door is measured using which tool?
- Ruler
- Measuring Tape
- Small paper clip
Why this matters
Measuring well is a practical skill your child will use for the rest of their life, in school projects, crafts, and building. Reading a ruler correctly means starting at zero and counting units rather than lines. Knowing which tool fits the job also builds a feel for how big an inch, a foot, and a meter are. In 3rd grade, children measure to the nearest half inch and quarter inch.
Where kids can get stuck
- Lining up the object with the ruler's edge or the 1 instead of zero, so every measurement is off.
- Counting the tick marks instead of the spaces between them, getting one more than the real length.
- Choosing a tool that does not fit, such as measuring a room with a 12-inch ruler and losing count.
How you can help
- Measure things around the house with a ruler and a measuring tape, such as a spoon, a shoe, and the couch, and ask your child which tool works best for each one.
- Help your child measure their height against a door frame with a measuring tape, and check it again in a few months to see how much they have grown.
- Ask your child to find something about 1 foot long and something about 1 meter long, then measure to check how close their guesses were.
The kid-friendly video below explains it in a few minutes, and Bobby's Math Club offers free practice that grows with your child.
Kid-friendly explanation
Questions parents ask
Why is my child learning to choose measuring tools?
Choosing a tool teaches your child to think about how long something is before measuring it. A ruler suits small objects, while a measuring tape suits long or curved ones. This builds a real sense of size and helps your child measure accurately and efficiently in everyday situations.
Does my child need to learn inches and centimeters?
Yes. In 2nd grade, children measure using both customary units, such as inches, feet, and yards; and metric units, such as centimeters and meters. Many rulers show inches on one side and centimeters on the other. Children do not convert between the two systems; they learn to use each.
Why does my child keep getting measurements that are slightly off?
The most common reason is starting at the edge of the ruler or at 1 instead of at the zero mark. On many rulers, zero is a little in from the end. Point to the zero mark and help your child line it up carefully. Counting spaces rather than lines also helps.
Make learning math fun
Bobby's Math Club turns 2nd grade math practice into something fun to do together.
- Free, unlimited practice for every child in your family
- Questions matched to your child’s level, a few minutes a day
- Level-ups, badges, and a cheer for every win
Written by Robert “Bobby” Barnett
Bobby is an award-winning math teacher, the author of Meet Every Learner’s Needs, and the father of two elementary-school math learners. He uses Bobby’s Math Club with his own kids a few times every week. Learn more or contact Bobby.
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Join the clubNote for teachers: This skill is covered by Common Core math standard 2.MD.A.1: “Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes.” Learn how Bobby's Math Club can help your students grow. (Common Core 2.MD.1)