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Mark the Number is a free printable Grade 2 math worksheet on placing a whole number on a number line, aligned to Common Core standard 2.MD.B.6. It prints 6 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students 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.

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All 25 sets ask different questions.

Mark the Number

2.MD.B.6

NameDate

Mark each number with an arrow.

1.Mark 15 on the line.
020406080100
2.Mark 80 on the line.
050100
3.Mark 55 on the line.
020406080100
4.Mark 45 on the line.
020406080100
5.Mark 18 on the line.
01020
6.Mark 50 on the line.
405060

LessonPrint · 2.MD.B.6 · Set 1 · free to copy for classroom use

Answer key — Mark the Number

Set 1. Prints on its own sheet.

  1. 1.15 — 3 ticks from 0
  2. 2.80 — 8 ticks from 0
  3. 3.55 — 11 ticks from 0
  4. 4.45 — 9 ticks from 0
  5. 5.18 — 9 ticks from 0
  6. 6.50 — 5 ticks from 40

Questions about Mark the Number

What does the Mark the Number worksheet cover?

It practices placing a whole number on a number line — 6 questions for Grade 2, all on Common Core 2.MD.B.6: Show whole numbers, and sums and differences within 100, as distances on a number line. The instruction to students is “Mark each number with an arrow”, and the answer key follows on the next sheet.

Which Common Core standard does Mark the Number practice?

CCSS.MATH.CONTENT.2.MD.B.6 — 2.MD.B.6, under Measurement & Data for Grade 2. The published standard reads: “Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Mark the Number is written for Grade 2, typically ages 7-8. It is one of the sheets on 2.MD.B.6, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.

Does Mark the Number come with an answer key?

Yes. All 6 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 Mark the Number can I print?

25 — one per student, 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 Mark the Number free to print and photocopy?

Yes. Mark the Number, 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.

More practice for 2.MD.B.6

Show whole numbers, and sums and differences within 100, as distances on a number line.

All Grade 2 worksheets

Last reviewed 2026-09-05. Aligned to 2.MD.B.6 of the Common Core State Standards for Mathematics.