Learning the numbers from one to one hundred in Spanish is a very straightforward task. In fact, our friends at El Aula Azul created a very useful video to aid us with the basics. While you will see that it isn't really necessary to memorize every digit from one to one hundred, we'll give you a couple of tips to keep in mind.
These you do need to memorize, and the numbers from one to ten are as follows: uno (1), dos (2), tres (3), cuatro (4), cinco (5), seis (6), siete (7), ocho (8), nueve (9), and diez (10). We suggest that you practice them by saying them out loud a number of times.
The numbers from eleven through twenty-nine also require some memorization, specifically those from eleven through fifteen, which are as follows: once (11), doce (12), trece (13), catorce (14), and quince (15).
You will then notice that there is a basic pattern to form the following digits: simply take diez (10) or veinte (20) and follow them with y plus the corresponding single digit to form your desired number. For example, if ten is diez, and six is seis, then sixteen will be "diez y seis." Similarly, if twenty is veinte and four is cuatro, then twenty-four must be "veinte y cuatro." Right? Well, almost!
A little trick will help you to learn to spell the names of the numbers sixteen through nineteen as well as twenty-one through twenty-nine correctly. Although those numbers were previously spelled as two words, their modern spellings are now preferred: Sixteen is written "dieciséis," nineteen is "diecinueve," twenty-nine is "veintinueve," and so on. The pattern is that, while the numbers sixteen through nineteen employ the prefix dieci (rather than diez y) followed by six through nine, the digits twenty-one through twenty-nine use "veinti" (not "veinte y") plus the numbers one through nine. Voilá! The number sixteen is therefore spelled dieciséis while twenty-four is veinticuatro.
The good news is that, after treinta (30), the previous spelling returns, and you can once again use the basic pattern: thirty-one is "treinta y uno," forty-eight is "cuarenta y ocho," etc. All that are left to memorize are th