Counting to 20 — Missing Numbers
K.CC.A.1
NameDate
Write the missing numbers.
1.10111215
2.4689
3.2567
4.13161718
5.691011
6.2467
7.681011
8.3568
LessonPrint · K.CC.A.1 · Set 1 · free to copy for classroom use
Counting to 20 — Missing Numbers is a free printable Kindergarten maths worksheet on the count sequence within 20, aligned to Common Core standard K.CC.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 1 of 25 · the same problems every time you open this link.
Next setAnswer key — Counting to 20 — Missing Numbers
Set 1. Prints on its own sheet.
- 1.13, 14
- 2.5, 7
- 3.3, 4
- 4.14, 15
- 5.7, 8
- 6.3, 5
- 7.7, 9
- 8.4, 7
Questions about Counting to 20 — Missing Numbers
What does the Counting to 20 — Missing Numbers worksheet cover?
It practises the count sequence within 20 — 8 questions for Kindergarten, all on Common Core K.CC.A.1: Count all the way to 100, both one at a time and in tens. The instruction to pupils is “Write the missing numbers”, and the answer key follows on the next sheet.
Which Common Core standard does Counting to 20 — Missing Numbers practise?
CCSS.MATH.CONTENT.K.CC.A.1 — K.CC.A.1, in the Counting & Cardinality domain for Kindergarten. The published standard reads: “Count to 100 by ones and by tens.” The worksheet assesses that standard rather than a paraphrase of it.
What age or grade is this worksheet for?
Counting to 20 — Missing Numbers is written for Kindergarten, typically ages 5-6. It is one of the sheets on K.CC.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.
Does Counting to 20 — Missing Numbers come with an answer key?
Yes. All 8 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 Counting to 20 — Missing Numbers 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 Counting to 20 — Missing Numbers free to print and photocopy?
Yes. Counting to 20 — Missing Numbers, 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 K.CC.A.1
Count all the way to 100, both one at a time and in tens.
Last reviewed 2026-09-05. Aligned to K.CC.A.1 of the Common Core State Standards for mathematics.