Our friends at El Aula Azul provided us with a video covering the basic numbers in Spanish. Learning the numbers from 1 to 100 in Spanish is a very straightforward task and you don't really need to memorize every digit from 1-100. However there are a couple of things to have in mind.
From 1 to 10
Ok, these you do need to memorize: uno (1), dos (2), tres (3), cuatro (4), cinco (5), seis (6), siete (7), ocho (8), nueve (9), and diez (10). We suggest you to practice them by saying them aloud a couple of times.
From 11 to 29
The numbers 11-29 also require some memorization, specially from 11 to 20. You will have to memorize once (11), doce (12), trece (13), catorce (14), and quince (15). After that you will notice there is a basic pattern to form the following numbers: you only need to take diez (10) or veinte (20) and follow them by the name of the corresponding digit to form the number you want. If 10 is diez and 6 is seis 16 must be "diez y seis," and if 20 is veinte and 4 is cuatro 24 must be "veinte y cuatro," right? Well, almost! There is a tiny trick to learn in order to spell correctly the numbers 16 through 19 and 21 through 29. Those numbers used to be spelled as two words in the past, but nowadays a modern spelling is preferred: 16 is "dieciséis," 19 is "diecinueve," 29 is "veintinueve," and so on. But wait, there's also a pattern here!: numbers 16-19 will use the prefix dieci (not "diez") followed by 6-9, and numbers 21-29 will use "veinti" (not "veinte") followed by the numbers 1-9. Voilá: 16 is dieciséis and 24 is veinticuatro.
From 30 to 100
The good news is that after treinta (30) the old spelling comes back and you can again use the basic pattern learned before: 31 is "treinta y uno," 48 is "cuarenta y ocho," etc. The only thing you need to memorize now are the numbers corresponding to las decenas (the multiples of ten). That is: veinte (20), treinta (30), cuarenta (40), cincuenta (50), sesenta (60), setenta (70), ochenta (80), noventa (90) and cien (100). You can use the pattern to figure out any other number between them: cuarenta y uno (41), sesenta y dos (62), ochenta y ocho (88), noventa y cuatro (94), etc.
Enjoy learning the numbers in Spanish!