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Sort by Shape is a free printable Kindergarten maths worksheet on classifying by a single attribute, aligned to Common Core standard K.MD.B.3. It prints 5 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 10 of 25 · the same problems every time you open this link.

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One paper per pupil

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Sort by Shape

K.MD.B.3

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: window, square, book, envelope

RoundStraight sides
2.Sort each one into the right box.

Sort: plate, circle, book, clock face

RoundStraight sides
3.Sort each one into the right box.

Sort: window, box, envelope, coin

RoundStraight sides
4.Sort each one into the right box.

Sort: book, box, coin, clock face

RoundStraight sides
5.Sort each one into the right box.

Sort: plate, door, window, box

RoundStraight sides

LessonPrint · K.MD.B.3 · Set 10 · free to copy for classroom use

Answer key — Sort by Shape

Set 10. Prints on its own sheet.

  1. 1.Round: —; Straight sides: window, square, book, envelope
  2. 2.Round: plate, circle, clock face; Straight sides: book
  3. 3.Round: coin; Straight sides: window, box, envelope
  4. 4.Round: coin, clock face; Straight sides: book, box
  5. 5.Round: plate; Straight sides: door, window, box

More practice for K.MD.B.3

Sort things into groups and count each group.

Teaching this next? Sorting into Groups and Counting is the 30-minute plan for it, with the misconceptions to expect.

All Kindergarten worksheets

Last reviewed 2026-09-05. Aligned to K.MD.B.3 of the Common Core State Standards for mathematics.