NY-2.NBT.7b
Understand that in adding or subtracting up to three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones, and sometimes it is necessary to compose or decompose tens or hundreds.
Khan Academy ResourcesSubtract within 1,000 using place value blocksSubtract on a number lineAdd on a number lineAdd within 1,000 using place value blocksAdd using groups of 10 and 100Select strategies for adding within 100Break apart 3-digit addition problemsSelect strategies for adding within 1000Breaking apart 3-digit addition problemsSubtracting 3-digit numbers (no regrouping)Adding 10 or 100Adding 1s, 10s, and 100sAdding and subtracting on number lineAddition using groups of 10 and 100Subtracting 1s, 10s, and 100sAdding 3-digit numbers (no regrouping)Subtracting 1, 10, or 100Subtracting with place value blocks (regrouping)

1-on-1 AI tutoring aligned to NY-2.NBT.7b. Instant help for students, real-time insights for teachers.
Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.
Free for teachers, forever →