2.N.4.d
Add up to three two-digit numbers using strategies based on place value and understanding of properties.
Khan Academy ResourcesAdd within 100 using place value blocksAdd within 100 using a number lineFind the missing number (add and subtract within 100)Select strategies for adding within 100Break apart 2-digit addition problemsSubtract within 100 using a number lineAdd 2-digit numbers by making tensAdding 10 or 100Missing numbers in addition and subtractionAddition and subtraction with number linesAdding 2-digit numbers without regroupingUnderstanding place value when adding onesStrategies for adding 2-digit numbersAdding with regroupingUnderstanding place value when adding tensBreaking apart 2-digit addition problemsAdding 53+17 by making a group of 10

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