Add a two-digit number and a multiple of 10.
Khan Academy ResourcesSubtract within 100 using place value blocksAdd within 100 using place value blocksAdd within 100 using a number lineAdding up to four 2-digit numbersSelect strategies for adding within 100Break apart 2-digit addition problemsSubtract within 100 using a number lineAdd 2-digit numbers by making tensAdding by making a group of 10Missing numbers in addition and subtractionAddition and subtraction with number linesAdding 2-digit numbers without regroupingSubtracting 1s using place valueSubtracting a 1-digit number with regroupingSubtracting 10s using place valueUnderstanding place value when adding onesStrategies for adding 2-digit numbersSubtracting two-digit numbers without regroupingAdding with regroupingUnderstanding place value when adding tensBreaking apart 2-digit addition problemsAdding 53+17 by making a group of 10
1-on-1 AI tutoring aligned to 1.NSBT.4b. 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 →