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Count by Tens to 120 is a free printable Grade 1 maths 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 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 25 of 25 · the same problems every time you open this link.

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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.

1.2939498999
2.39495999109
3.2737677797
4.1727475787
5.37475787107
6.1747677787
7.1131517181
8.36567696106

LessonPrint · 1.NBT.A.1 · Set 25 · free to copy for classroom use

Answer key — Count by Tens to 120

Set 25. Prints on its own sheet.

  1. 1.59, 69, 79
  2. 2.69, 79, 89
  3. 3.47, 57, 87
  4. 4.37, 67, 77
  5. 5.67, 77, 97
  6. 6.27, 37, 57
  7. 7.21, 41, 61
  8. 8.46, 66, 86

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