KMeasuring and SortingK.MD.B.3

Sorting and Counting

Sort objects into groups, count each group and order them.

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Sorting means putting things that are alike together. Then you can count each group and compare them.

A jumble of apples, stars and balls. Tap one kind at a time to count it.
  • Choose a sorting rule: by kind, color or size.
  • Put each thing in its group.
  • Count each group.
  • Put the groups in order from fewest to most.

Key idea

Sort by a rule, count each group, then compare the numbers.

Why it works

Sorting turns a jumble into groups. Groups are easy to count and compare.

Worked example: Which has the most?

Sort the picture above. Which kind has the most?
  1. Apples: 3. Stars: 5. Balls: 2.
  2. 5 is the biggest number.
  3. Stars have the most. Balls have the fewest.

Answer: Stars

For grown-ups: Sort laundry, toys or snacks together. Ask, “Which group has the most? Which has the fewest?”

Practice

Pass with 3 right answers, the last 2 in a row. Each right answer earns 1 XP.

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Sources and further reading

  • Common Core State Standards for Mathematics, Kindergarten, K.MD.B.3: classify objects into categories, count each category and sort the categories by count
  • Institute of Education Sciences practice guide: Teaching Math to Young Children (NCEE 2014-4005)
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