Do your students struggle with spelling in Spanish? Even though Spanish is a much more transparent language than English, there are plenty of confusing letters that can give our students problems. I've created a unit focusing on the sonido fuerte and sonido suave of the letters r/rr based on the methods described in one of my favorite books, Words Their Way. You can download the printables for $1 here!
No matter what the grade, I think picture sorts are a great place to start a unit, especially with the letters r/rr. Ask students to identify whether the r sound in each picture sounds fuerte or suave. When students are able to do this successfully, begin using the word cards. I would suggest using Level A for first grade, Level B for second grade, and Level C for third grade. Of course, you could also use all three levels to differentiate in one grade level!
After you sort the word cards based solely on the sound, ask students to look closely at the r or rr in each word. Use the second sorting mat to divide the cards in the sonido fuerte column into two more categories. Ideally, your students will figure out this pattern on their own but if they are still new at sorting, you may need to point it out.
If you have time during that lesson, have the students wipe their mats clean and do a speed sort a few more times. Throughout the rest of the week, students can pair up and do a no-peeking sort that will help them remember and apply the pattern. To do a no-peeking sort, have one partner read the word while the other partner writes the word in the appropriate column on the sort mat (sticking the mat in a sheet protector with dry-erase markers works great!). The first partners checks the spelling and then they switch roles.