You can just slow down CLE and skip the speed drills. Use buttons, sticks, rocks, and beads to build the new math facts.
I love Karen Rodriguez’s videos. She is so practical! 🙂 Here are a couple for math remediation. You could pause CLE, use Ray’s how she shows in her videos to get caught up, and then switch back to CLE.
https://youtu.be/lPy4OsDWxFo
https://youtu.be/BF-PKAE-_Aw
Aother option: There is a free book on archive.org called “First Year in Number”. It starts out teaching math through pictures so the child can see what numbers mean and represent. For example, one page has girls on a teeter-totter. There are some on each side and one standing in the middle. The text asks you to find 4 (the group of girls on one side), find 3 (girls on the other side), and 1 (the girl in the middle). Addition begins with pictures. If it wants you to add 2 and 2, it’ll say “What are (picture of 2 rabbits) and (pic of 2 more rabbits)?” Then beneath that it says “2 rabbits and 2 rabbits make __ rabbits.” 🙂