Numbers in Esperanto

Numbers in Esperanto are very simple. There is a Memrise course for this, but I will give a brief explanation first. In Esperanto, the only numbers you rally need to know are 1-10. After that, you can form other numbers using those ones. To make a multiple of ten, like twenty or fifty, you just use the word for a number and add it to the word for "ten". For example, if you want to say seventy, you take the word for "seven", "sep", and add it to the word for "ten", "dek". So, you get that "sepdek" is "seventy". You can do the same thing with a hundred - since "kvar" is "four" and "cent" is "hundred", four hundred is "kvarcent". Now, if you want to say something like "sixty-three", then you use a space. The word for "six" is "ses" and the word for "three" is "tri", and we already know that "dek" is "ten". So, first we need sixty, so we say "sesdek", then we need three, so we say "tri". So, we get "sesdek tri". Note that We use a space between the tens and the units place, the hundreds and the tens place, etc, but not within a certain place. So we have a space between the "sesdek" and "tri", since "sesdek" is the tens place and "tri" is the units place, but we have no space between "ses" and "dek" in "sesdek", since the entire "sesdek" makes up the tens place. Here's the link to the Memrise course.