Number words means writing numbers using alphabets.
Practice your number words one to twenty with this free worksheet. 
Write the number word for the numbers 1 to 20.

1 - one            11 - eleven
2 - two            12 - twelve
3 - three          13 - thirteen
4 - four           14 - fourteen
5 - five            15 - fifteen
6 - six             16 - sixteen
7 - seven         17 - seventeen
8 - eight          18 - eighteen
9 - nine           19 - nineteen
10 - ten           20 - twenty