WA.3. Writing: The student writes clearly and effectively.
3.3. Knows and applies writing conventions appropriate for the grade level.
3.3.4. Applies punctuation rules.
3.3.4.a. Uses punctuation rules from previous grades.
3.3.4.e. Uses apostrophes to form plurals of letters or numbers (e.g., Know your ABC's.).
3.3.4.f. Uses apostrophes in possessive compound nouns (e.g., the mother-in-law's birthday).
3.3.4.h. Uses diagonal slash (/) correctly: in a fraction; to show choice
3.3.4.i. Uses resources to check punctuation.