How Long? Count the Units is a free printable Kindergarten maths worksheet on measuring a length by counting unit lengths, aligned to Common Core standard K.MD.A.1. It prints 4 questions with an answer key on its own sheet of paper, in 25 versions, 21 of them with 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 20 of 25 · the same problems every time you open this link.

One paper per pupil

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Set 1 has all 25 in a single PDF. 21 of these 25 sets ask different questions — this skill does not have 25 questions to give. The rest reorder them, so no two pupils have the same paper in front of them.

How Long? Count the Units

K.MD.A.1

NameDate

How many units long?

LessonPrint · K.MD.A.1 · Set 20 · free to copy for classroom use

Answer key — How Long? Count the Units

Set 20. Prints on its own sheet.

Last reviewed 2026-09-05. Aligned to K.MD.A.1 of the Common Core State Standards for mathematics.