Skip to main content
Common Core MathKindergartenMeasurement & Data

K.MD.2: Compare Two Objects Directly

Also written as K.MD.A.2 and CCSS.MATH.CONTENT.K.MD.A.2 · Cluster: Describe and compare measurable attributes.

Make a K.MD.2 WorksheetAll 22 Kindergarten Math Standards

The Official Wording

Directly compare two objects with a measurable attribute in common, to see which object has "more of"/"less of" the attribute, and describe the difference. For example, directly compare the heights of two children and describe one child as taller/shorter.

Common Core State Standards, Kindergarten, Measurement & Data · Read it at the source · Checked October 14, 2026

What K.MD.2 Means in Plain English

Kindergartners put two things next to each other and say which has more of something. Two pencils, bottoms lined up: this one is longer, that one is shorter. Two lunchboxes, one in each hand: this one is heavier. The objects touch, and nothing is measured in units.

The hard part is fair comparison: the pencils must start from the same line or the longer one can look shorter. The words themselves, taller, shorter, heavier, lighter, come from K.MD.1. In 1st grade students order three objects and compare two through a third (1.MD.1).

K.MD.2 I Can Statements

  • I can line up two objects to see which is longer.
  • I can hold two objects to tell which is heavier.
  • I can say how two objects are different, like taller or shorter.

K.MD.2 Worked Example

Two pencils compared the fair way, with the one move that makes the answer trustworthy.

Problem

Maya has a yellow pencil and a green pencil. Which one is longer?

Which pencil is longer?
  1. Lay both pencils flat on the table, side by side, close enough to touch.yellow pencil, green pencil, side by side
  2. Slide them so the eraser ends line up against the same edge. Now the start is fair.both erasers touching the table edge
  3. Look at the other ends. The one that sticks out farther is longer.the yellow pencil sticks out past the green one
  4. Say it both ways, with the word for the difference.yellow is longer, green is shorter
AnswerThe yellow pencil is longer than the green pencil.

Check it: Swap the pencils’ places and line them up again. The yellow one still sticks out, so the answer holds.

Common Mistakes with K.MD.2

Comparing from different starting points

One pencil is pushed farther up the table, so the shorter one looks longer

Try this: Set a starting line, like the table edge or a strip of tape, and make both objects touch it before anyone decides.

Bigger means heavier

A large empty box is called heavier than a small rock without lifting either

Try this: Put one in each hand and ask which pulls down more. Size and weight are different attributes, and hands know the difference.

Only naming the winner

“The yellow one.” with no word for how it is different

Try this: Require the comparison word every time: longer, shorter, taller, heavier. Then ask the child to say it the other way around.

Where K.MD.2 Fits

Comes BeforeK.MD.1Name what can be measured on an object, like length or weight.K.CC.6Tell which group has more or fewer objects, by matching or counting.
AlongsideK.MD.3Sort objects into categories and count each category.K.G.4Compare shapes by their parts, like sides of equal length.
Comes Next1.MD.1Order three objects by length and compare two lengths using a third object.1.MD.2Lay same-size units end to end to measure length.2.MD.4Measure two objects and say how much longer one is in units.

Practice K.MD.2

Math Worksheet GeneratorFree ToolKindergarten comparison pages: two objects per row, circle the longer or the heavier one. Keep a real pencil pair on each desk so the picture can be checked against the thing.KindergartenCompare lengthsAnswer key
Make a Worksheet
Graph Paper GeneratorFree ToolGrid paper as a fair starting line. Students lay two crayons along the same bottom row and see which one reaches more squares, which also previews measuring with units.Large squaresOne page
Make Graph Paper

Quick Check

  1. Two ribbons are on the table, but one starts farther up than the other. What should you do before saying which is longer?
  2. Jonah is taller than Priya. What is another way to say that?
  3. A feather pillow is bigger than a can of soup. Which is heavier, and how could you check?

K.MD.2: Other Names

K.MD.2K.MD.A.2CCSS.MATH.CONTENT.K.MD.A.2

Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. Official wording from the Common Core State Standards PDFs at corestandards.org, last checked October 14, 2026. The explanation, I can statements, example, mistakes and practice on this page are EMStudio’s own, written beside the official wording. They are not part of the standard.