2nd graders in class 2-124 are greeted with smiles as they check in with Ms. Egan and Ms. Garofalo at PS 81 in Riverdale.

Casey gives dad Ken Shallcross a good-bye kiss with supplies in hand for the first day at PS 81 in Riverdale.

2nd-grade teacher Larissa Loua meets with her new students at PS 44 on Staten Island.

Secretary June Volpe shows off her first-day paperwork at PS 44 on Staten Island.

Mom Shaquawna Meaders looks on as her son, Charon Brown, says bye to his pal Cocoa at PS 44, Staten Island.

A sign welcomes students back to school at PS 88 in Ridgewood.

Students head into school at PS 277 in the Bronx.

The 2nd-grade team at PS 44 on Staten Island wears matching shirts that say, "Teaching is my thing!"

Lucas and Nathan, twin boys, start kindergarten at PS 212 in Jackson Heights.

Gavin and Eitan are excited for kindergarten at PS 196Q.

Fourth-grade co-teachers Jennifer Alves and Amy-Beth Lalicata gather their new class in the schoolyard at PS 212 in Jackson Heights, Queens

A welcome back sign at PS 124 in Chinatown

A first-day family photo at PS 196Q.

Svati Lelyveld teaches 8th-grade social studies at MS 331 in the Bronx.

It's the first day of kindergarten at PS 261 in Brooklyn.

Teachers at PS 199 in Brooklyn are ready to start the day.

Benjamin starts first grade and Tomás starts pre-k, both at PS 69Q.

A back-to-school father/son selfie at PS 199 in Brooklyn

Matching outfits for these brothers at PS 199 in Brooklyn.

One last glimpse at PS 306 in the Bronx.

Jarrett is dressed in a snazzy outfit at PS 306 in the Bronx

2nd-grader Corte Ellis and his family are psyched for school!

The crossing guard is back on duty at PS 88 in Ridgewood.

Crossing guard Zaraida Torres greets Robert Jackson and his daughter Camille, a 3rd-grader at PS 8 in Brooklyn.

Strollers and dogs wait for their owners to return at PS 8 in Brooklyn.

A ferry full of Harbor School students pulls into the slip at Governors Island.

New York Harbor School seniors get set for their last hurrah.