Twenty is the biggest number you can count on fingers and toes.
You have 10 fingers and 10 toes. Count them all and you land on exactly 20 — no more wiggly bits to count!
💡 Số 11–20 — Fun Facts
Fun “Did you know?” facts about Số 11–20 — tap through 10 at a time!
The 'teen' in thirteen to nineteen really means 'plus ten'.
Thir-teen is like three-and-ten, and six-teen is six-and-ten. The word 'teen' is a sneaky way of saying 'add ten'!
In Vietnamese, 11 is 'mười một', which means 'ten one'.
Vietnamese builds the number from its parts: ten ('mười') and one ('một'). So the name tells you it is ten plus one!
Twenty means two tens, or 10 and 10 together.
If you put two groups of ten side by side, you get 20. That is why twenty is written with a 2 and a 0.
Each number from 11 to 20 is one ten plus some ones.
The number 13 is one ten and three ones. That is why it is written with a 1 and a 3 next to each other.
Eleven and twelve have special names, but 13 to 19 end in 'teen'.
After the special words eleven and twelve, we get thirteen, fourteen, and friends. The 'teen' ending is a helpful clue!
The numbers 11 to 20 come right after 10.
Keep counting past ten and you reach 11, 12, 13, and on up to 20. They are the numbers in your second handful of ten.