Use the formation rhyme:
Learning to write "j" involves mastering both the shape and the "froggy-leg" tripod grip. The World's Leading Phonics Programme - Jolly Learning
Once the sound is mastered, it’s time to put it to work. 'j' usually appears at the beginning of words for early learners. jolly phonics j
(Emphasize the /j/ sound at the end of each line.)
Writing 'j' can be tricky because it is a "descender"—it hangs below the line. Use the formation rhyme: Learning to write "j"
Use flashcards or a whiteboard. Blend each word sound-by-sound:
Can the child:
Say a word clearly, then ask children to "sound it out" on their fingers before writing.