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Common Core MathKindergartenMeasurement & Data

K.MD.3: Sort Objects and Count Each Group

Also written as K.MD.B.3 and CCSS.MATH.CONTENT.K.MD.B.3 · Cluster: Classify objects and count the number of objects in each category.

Make a K.MD.3 WorksheetAll 22 Kindergarten Math Standards

The Official Wording

Classify objects into given categories; count the numbers of objects in each category and sort the categories by count.

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

What K.MD.3 Means in Plain English

Kindergartners sort a pile of objects into groups you name, then count each group and line the groups up from most to fewest. Ten buttons: 5 red, 3 blue, 2 yellow. Red is the biggest group, yellow the smallest. Each group stays under 10 so counting is quick.

This is the first data standard: the sorted rows of buttons are a bar graph made of real things. Children who can say “red has the most” are reading data. In 1st grade the groups become a chart with up to three categories and how-many-more questions (1.MD.4).

K.MD.3 I Can Statements

  • I can sort objects into the groups my teacher names.
  • I can count how many are in each group.
  • I can put the groups in order from most to fewest.

K.MD.3 Worked Example

Ten buttons sorted, counted and lined up, the whole standard in one handful.

Problem

Here are 10 buttons. Sort them by color, count each color, and put the colors in order from most to fewest.

Sorting a handful of buttons by color
  1. Make one pile for each color. Every button goes in exactly one pile.red pile, blue pile, yellow pile
  2. Count the red pile, touching each button once.red: 1, 2, 3, 4, 5
  3. Count the other two piles the same way.blue: 3, yellow: 2
  4. Which number is biggest? Put that pile first, then the next, then the smallest.red 5, blue 3, yellow 2
  5. Check that nothing is lost: all the piles together should make the 10 we started with.5 + 3 + 2 = 10
AnswerRed (5), then blue (3), then yellow (2): red has the most and yellow has the fewest.

Check it: Line each pile up in a row, buttons touching, with the rows starting at the same edge. The longest row is the biggest group.

Common Mistakes with K.MD.3

Changing the rule mid-sort

Starts sorting by color, then puts a big red button with the big blue ones

Try this: Name the rule out loud before the first button moves, and label each pile with a color card the child can check against.

Ordering by size instead of count

The pile with the biggest buttons is called the group with the most

Try this: Spread each pile into a row with the buttons touching, then count every row and write its number on a sticky note.

Losing buttons between piles

5 red, 3 blue, 1 yellow, and one button still in the child’s hand

Try this: Count the whole set first, then count the piles together at the end. Both counts must come out to 10.

Where K.MD.3 Fits

Comes BeforeK.CC.5Count up to 20 objects and answer how many.K.CC.6Tell which of two groups has more or fewer.
AlongsideK.MD.2Compare two objects directly by length or weight.K.CC.7Compare two written numbers from 1 to 10, like 5 is more than 3.
Comes Next1.MD.4Organize data with up to three categories and answer how many more or fewer.2.MD.10Draw a picture graph or bar graph with up to four categories.

Practice K.MD.3

Math Worksheet GeneratorFree ToolKindergarten sorting and counting pages: a mixed set of pictures, boxes to sort them into, and a line to write each count. Ask students to circle the biggest group.KindergartenSort and countAnswer key
Make a Worksheet
Graph Paper GeneratorFree ToolLarge-square grid paper turns the sorted piles into a bar graph: one column per color, one button per square, so the tallest column is the biggest group.Large squaresOne page
Make Graph Paper

Quick Check

  1. You sort 8 crayons by color and get 4 green, 3 orange and 1 purple. Which color has the most? Which has the fewest?
  2. Put these groups in order from most to fewest: 2 cars, 6 blocks, 4 balls.
  3. Leo sorts his 9 toy animals into farm animals and zoo animals. He counts 5 farm animals. How many zoo animals should there be?

K.MD.3: Other Names

K.MD.3K.MD.B.3CCSS.MATH.CONTENT.K.MD.B.3

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.