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Count by Tens to 120 is a free printable Grade 1 math worksheet on the decade sequence past one hundred, aligned to Common Core standard 1.NBT.A.1. It prints 8 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 6 of 25 · the same problems every time you open this link.

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One paper per student

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

Count by Tens to 120

1.NBT.A.1

NameDate

Write the missing numbers.

1.508090110120
2.50608090120
3.506070110120
4.40506080110
5.40506070110
6.507080100120
7.506080100120
8.506090110120

LessonPrint · 1.NBT.A.1 · Set 6 · free to copy for classroom use

Answer key — Count by Tens to 120

Set 6. Prints on its own sheet.

  1. 1.60, 70, 100
  2. 2.70, 100, 110
  3. 3.80, 90, 100
  4. 4.70, 90, 100
  5. 5.80, 90, 100
  6. 6.60, 90, 110
  7. 7.70, 90, 110
  8. 8.70, 80, 100

Last reviewed 2026-09-05. Aligned to 1.NBT.A.1 of the Common Core State Standards for Mathematics.