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Sort by Size is a free printable Kindergarten maths worksheet on classifying by magnitude, 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 22 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 Size

K.MD.B.3

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: bus, tree, crumb, ant

SmallBig
2.Sort each one into the right box.

Sort: mountain, crumb, button, ant

SmallBig
3.Sort each one into the right box.

Sort: pea, house, ant, mountain

SmallBig
4.Sort each one into the right box.

Sort: button, tree, ant, lorry

SmallBig
5.Sort each one into the right box.

Sort: mountain, house, whale, ant

SmallBig

LessonPrint · K.MD.B.3 · Set 22 · free to copy for classroom use

Answer key — Sort by Size

Set 22. Prints on its own sheet.

  1. 1.Small: crumb, ant; Big: bus, tree
  2. 2.Small: crumb, button, ant; Big: mountain
  3. 3.Small: pea, ant; Big: house, mountain
  4. 4.Small: button, ant; Big: tree, lorry
  5. 5.Small: ant; Big: mountain, house, whale

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.