We use commas in lists. Put commas between each thing. Cats, dogs, and birds has commas after each word.

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The sentence lists 3 items: red, blue, and yellow. Commas separate each item from the next one. We use commas between all the items, and 'and' before the last item. Choice A is correct because it has commas between the items red, blue, and yellow. The commas separate each item so we can tell them apart. Choice B represents a missing comma error. Students make this error because they forget lists need commas (say items with 'and' between each without commas). To help students: For LISTS, practice with physical objects: lay out 3-4 items, say them with pauses 'apples (pause/comma) oranges (pause/comma) and bananas.' Show that commas are like pauses between items. Use highlighting: highlight where commas go. Create anchor charts: 'Commas in Lists: cats, dogs, and birds.' Watch for students missing commas between list items or using commas for only two items when not needed. Key concepts: (1) In lists, commas separate each item from the next. (2) Two items = no comma needed ('cats and dogs'), Three or more items = commas needed ('cats, dogs, and birds').

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The sentence lists 3 items: blocks, cars, and dolls. Commas separate each item from the next one. We use commas between all the items, and 'and' before the last item. Choice B is correct because it has commas between the items blocks, cars, and dolls. The commas separate each item so we can tell them apart. Choice A represents a missing comma error. Students make this error because they forget lists need commas (say items with 'and' between each without commas). To help students: For LISTS, practice with physical objects: lay out 3-4 items, say them with pauses 'apples (pause/comma) oranges (pause/comma) and bananas.' Show that commas are like pauses between items. Use highlighting: highlight where commas go. Create anchor charts: 'Commas in Lists: cats, dogs, and birds.' Watch for students missing commas between list items or using commas for only two items when not needed. Key concepts: (1) In lists, commas separate each item from the next. (2) Two items = no comma needed ('cats and dogs'), Three or more items = commas needed ('cats, dogs, and birds').

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The date shows January 15 2025, and the comma comes AFTER the day number (15) and BEFORE the year (2025), separating these two parts: January 15, 2025. Choice A is correct because it has the comma in the right place - after the day number (15) and before the year (2025). This follows the pattern: Month day, year. Choice B represents a wrong placement error. Students make this error because they put commas in wrong places (after month instead of after day). To help students: For DATES, use visual: write 'Month day, year' pattern and practice with real dates (students' birthdays). Have them physically place comma after day number. Teach mnemonic: 'After the day, take a break (comma) before the year!' Create anchor charts: 'Commas in Dates: June 5, 2018' and watch for students putting comma after month (January, 15 2025 - wrong) or forgetting comma in dates (January 15 2025). Key concepts: (1) Commas SEPARATE - they split things apart to make them clear. (2) In dates, comma separates day from year.

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The sentence lists 3 items: cats, dogs, and birds. Commas separate each item from the next one. We use commas between all the items, and 'and' before the last item. Choice B is correct because it has commas between the items cats, dogs, and birds. The commas separate each item so we can tell them apart. Choice A represents a missing comma error. Students make this error because they forget lists need commas (say items with 'and' between each without commas). To help students: For LISTS, practice with physical objects: lay out 3-4 items, say them with pauses 'apples (pause/comma) oranges (pause/comma) and bananas.' Show that commas are like pauses between items. Use highlighting: highlight where commas go. Create anchor charts: 'Commas in Lists: cats, dogs, and birds.' Watch for students missing commas between list items or using commas for only two items when not needed. Key concepts: (1) In lists, commas separate each item from the next. (2) Two items = no comma needed ('cats and dogs'), Three or more items = commas needed ('cats, dogs, and birds').

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The date shows March 10 2019, and the comma comes AFTER the day number (10) and BEFORE the year (2019), separating these two parts: March 10, 2019. Choice C is correct because it has the comma in the right place - after the day number (10) and before the year (2019). This follows the pattern: Month day, year. Choice A represents a missing comma error. Students make this error because they forget dates need commas (think it's just 'March 10 2019' all together). To help students: For DATES, use visual: write 'Month day, year' pattern and practice with real dates (students' birthdays). Have them physically place comma after day number. Teach mnemonic: 'After the day, take a break (comma) before the year!' Create anchor charts: 'Commas in Dates: June 5, 2018' and watch for students forgetting commas entirely or putting comma after month (March, 10 2019 - wrong). Key concepts: (1) Commas SEPARATE - they split things apart to make them clear. (2) In dates, comma separates day from year.

This question tests 1st grade comma usage in dates and lists (CCSS.L.1.2.c: Use commas in dates and to separate single words in a series). Commas are used for two main purposes in 1st grade: (1) In DATES to separate the day from the year - we write Month + day, year with a comma after the day number and before the year (example: June 5, 2018 - comma after 5, before 2018). (2) In LISTS to separate three or more items - we put commas between items in a series (example: apples, oranges, and bananas - commas separate the items so we know they're different things). Note: We don't need a comma when listing only two items (apples and oranges - no comma needed for just two). The date shows June 5 2018, and the comma comes AFTER the day number (5) and BEFORE the year (2018), separating these two parts: June 5, 2018. Choice B is correct because it has the comma in the right place - after the day number (5) and before the year (2018). This follows the pattern: Month day, year. Choice A represents a wrong placement error. Students make this error because they put commas in wrong places (after month instead of after day). To help students: For DATES, use visual: write 'Month day, year' pattern and practice with real dates (students' birthdays). Have them physically place comma after day number. Teach mnemonic: 'After the day, take a break (comma) before the year!' Create anchor charts: 'Commas in Dates: June 5, 2018' and watch for students putting comma after month (June, 5 2018 - wrong) or forgetting comma in dates (June 5 2018). Key concepts: (1) Commas SEPARATE - they split things apart to make them clear. (2) In dates, comma separates day from year.

Dates need a comma after the day. January 15, 2025 has the comma after 15. This makes the date easy to read.

Dates need a comma after the day. January 15, 2025 has the comma after 15. This makes the date easy to read.

Lists need commas between things. Red, blue, and yellow has commas after red and blue. This helps us see each color.