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 1 of 25 · the same problems every time you open this link.
LessonPrint · K.MD.B.3 · Set 1 · free to copy for classroom use
Answer key — Sort by Size
Set 1. Prints on its own sheet.
1.Small: crumb; Big: whale, mountain, tree
2.Small: button, seed; Big: whale, lorry
3.Small: ant, pea; Big: house, whale
4.Small: button, ant, seed; Big: tree
5.Small: coin; Big: whale, mountain, tree
Questions about Sort by Size
What does the Sort by Size worksheet cover?
It practises classifying by magnitude — 5 questions for Kindergarten, all on Common Core K.MD.B.3: Sort things into groups and count each group. The instruction to pupils is “Sort each one into the right box”, and the answer key follows on the next sheet.
Which Common Core standard does Sort by Size practise?
CCSS.MATH.CONTENT.K.MD.B.3 — K.MD.B.3, in the Measurement & Data domain for Kindergarten. The published standard reads: “Classify objects into given categories; count the numbers of objects in each category and sort the categories by count.” The worksheet assesses that standard rather than a paraphrase of it.
What age or grade is this worksheet for?
Sort by Size is written for Kindergarten, typically ages 5-6. It is one of the sheets on K.MD.B.3, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.
Does Sort by Size come with an answer key?
Yes. All 5 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.
How many different versions of Sort by Size can I print?
25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.
Is Sort by Size free to print and photocopy?
Yes. Sort by Size, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.
Is there a lesson plan to teach K.MD.B.3?
Yes — “Sorting into Groups and Counting” is a 30-minute Kindergarten plan for K.MD.B.3, timed section by section, with the misconceptions to expect and an exit ticket. Sort by Size is the practice that follows it.