Counting to 20 — Numbers Beyond 10
You learned to count to 10 — amazing! Now it's time to go further. The numbers 11 to 20 are called "teen numbers," and they all have something special in common: they're 10 plus some more! Counting to 20 helps children see that bigger numbers are built from smaller parts, especially one full group of ten and some extra ones. This topic is important because the teen numbers can sound less regular than 1 to 10. Children often need extra practice hearing, reading, and building those numbers so they stop feeling random. When students understand 14 as one ten and four more, the number becomes easier to remember and use. Counting to 20 also builds stamina and accuracy. Children practice keeping track for longer, noticing number order in the teens, and connecting spoken counting to real collections of objects. Counting to 20 is also a chance to notice structure in numbers. When children hear teen numbers as 10 and some more, they are building the first layer of place value understanding. That idea makes later addition, subtraction, and comparing numbers much easier.
The Teen Numbers: 11 to 19
The teen numbers might sound tricky, but they follow a pattern:
11 — eleven (10 + 1 more) 12 — twelve (10 + 2 more) 13 — thirteen (10 + 3 more) 14 — fourteen (10 + 4 more) 15 — fifteen (10 + 5 more) 16 — sixteen (10 + 6 more) 17 — seventeen (10 + 7 more) 18 — eighteen (10 + 8 more) 19 — nineteen (10 + 9 more)
See the pattern? Every teen number is just 10 plus a number you already know! This pattern helps children stop seeing the teen numbers as random names and begin seeing how the numbers are built.
The Special Number: 20
20 is special because it's 2 groups of 10! If you fill up two ten-frames, you have exactly 20.
20 = 10 + 10
Twenty is the gateway to even bigger numbers. Once you can count to 20, you are ready to compare bigger groups, read longer number lines, and think about numbers in organized bundles.
It also shows a powerful idea: numbers can be grouped in helpful ways. Ten and ten make twenty, just like smaller groups can be put together to make a larger total.
Practice Counting to 20
Let's count all the way: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20! 🎉
Now try counting 20 objects. Line up 20 crayons, 20 blocks, or 20 cereal pieces and count each one. Remember to touch each one as you count!
Children build confidence when they count the same collection in more than one way. They might count 10 red cubes and 10 blue cubes, then combine them and count to 20. This shows that the total stays the same even when the objects are grouped differently.
It is also helpful to count on from 10 instead of restarting at 1 every time. Saying 10, 11, 12, 13 helps children hear the teen-number sequence as one connected stretch instead of two separate counting tasks.
Use Teen Numbers in Real Groups
Teen numbers become easier when children connect them to real groups. A carton with 12 eggs means 10 eggs and 2 more. A class line of 18 children means 10 children and 8 more.
These examples help children understand that the number tells how many objects there are altogether, even when the group is larger than ten. They also prepare students for Grade 1 place value.
A helpful question is, "Do you see one ten and some more?" That language helps children describe the number in a strong, organized way.
This is the beginning of place-value thinking. Children are not only naming a number. They are seeing how the number is built. That structure becomes very important when they later read, compare, and add larger numbers.
📝 Key Vocabulary
📐 Standards Alignment
Count to 100 by ones and by tens.
Understand the relationship between numbers and quantities.
Compose and decompose numbers from 11 to 19 into ten ones and some further ones.
View all Kindergarten Mathematics standards →
🔗 Glossary Connections
⚠️ Common Mistakes to Watch For
- Mixing up 12 and 20, or 13 and 30 — practice writing these numbers side by side
- Losing track in the teens — counting songs help!