Numerical words, either cardinal numerals or ordinal numerals, are easy and common. More or less everyone uses them in everyday life. If you are tutor or anyone who is curios to the big picture of English numerals, this
Wikipedia page may give some clues. For very young kids who are starting to learn some basic numbers, the video is a wonderful start point to know 1, 2, 3, and more. It's also an excellent warm-up to spell numerals in this app.
This app is designed to exercise cardinal and ordinal spelling in interactive way.It assumes you already knew these words, just helps you spell them correctly.
All words are grouped into 6 pages.The app checks each letter you input, warns whenever your inputting is wrong, and will terminate your challenging after 3 failures.It's a handy and smart tool to practice numerical spelling.