Numbers to 20 — for parents

In first grade, most national curricula expect a child to read, write and order any number from 0 to 20 by the end of the year, and to start understanding the idea of tens and ones. This article gives you a few practical ways to support that at home — without flashcards, without pressure.

What "knowing 20" really means

A child who confidently knows numbers up to 20 can:

name any number you point to,
write it down without copying,
say which is bigger, which is smaller,
explain that 14 is "one ten and four more".

The last one is the trickiest and the most important — it is the foundation for adding and subtracting later.

Why eleven and twelve are special

In English, eleven and twelve are odd ducks. They do not say "ten-one" or "ten-two" the way thirteen, fourteen and so on do. Children sometimes mix them up. Read them aloud often, point to them on the calendar, the clock, the elevator buttons.

Things you can do at home

Count the stairs going up to the bedroom — out loud, every day.
When you set the table, ask "how many forks?" then "how many knives?" then "how many in total?"
Turn the pages of a book together and read the page numbers. Many books pass 10, 11, 12 quickly.
Write a number in the air with your finger and let your child guess it.
Sort 20 small toys into "bags of ten" using two paper plates.

Common bumps

Mixing up the order of digits — writing 41 instead of 14. This is normal and fades by the end of first grade. Show the bag-and-loose-marbles picture.
Reverting to counting from 1 every time. Encourage starting from any number: "start at 7 and count three more".
Skipping a number. Slow down. Use fingers as anchors.

Ready for more

When your child is comfortable with 0–20, the next step is adding and subtracting within 20. We have a topic for that too — visit Addition and subtraction within 20.

← Worked examples