10 printable sets · answer key on every set

Counting 11 to 20 Worksheets

CCSS K.CC.A.2
20 problems per set
Answer key included

What this skill is

Counting past ten, where the number names stop being predictable.

When it comes up: Second half of kindergarten.

The mistake to watch for

"Eleven, twelve, thirteen…" is memorized as a song, so children write 11 as "110" — they hear "one, one" and write both digits separately.

How to help

Build each teen number with ten objects in a row plus the extras. Thirteen is ten and three, and the numeral shows exactly that.

Next: Number bonds to 10, which turn counting into arithmetic.

A worked example

Look at 14, 15, ___, 17. After fifteen comes sixteen, so the missing number is 16. Teen numbers are a ten plus some ones — 16 is ten and six.

Words to know

count: To say numbers in order to find out how many there are.
number: A word or symbol that tells how many, like 5 or twelve.
next: The one that comes right after.
ten: The number 10, one more than nine.
twenty: The number 20, two tens.

Practice

Write the missing number.

Showing Set 1 · 20 problems

12, ___, 14, 15, 16
14, 15, 16, 17, ___
13, 14, 15, ___, 17
16, 17, ___, 19, 20
14, 15, 16, ___, 18
14, ___, 16, 17, 18
16, 17, 18, ___, 20
15, ___, 17, 18, 19
12, 13, 14, ___, 16
11, ___, 13, 14, 15
16, 17, 18, 19, ___
16, ___, 18, 19, 20
13, 14, ___, 16, 17
13, 14, 15, 16, ___
___, 16, 17, 18, 19
12, 13, 14, 15, ___
___, 17, 18, 19, 20
___, 14, 15, 16, 17
___, 13, 14, 15, 16
15, 16, ___, 18, 19

Download this set20 problems · answer key included PDF

Answer key

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against K.CC.A.2 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.