2.N.2.4
Use strategies and algorithms based on knowledge of place value and equality to add and subtract two-digit numbers.
Khan Academy ResourcesSubtract within 100 using place value blocksAdd within 100 using place value blocksSubtract within 20 visuallyAdd within 100 using a number lineSubtraction word problems within 100Add within 20 visually2-step subtraction word problems within 100Find the missing number (add and subtract within 100)Adding up to four 2-digit numbers word problemsAdding up to four 2-digit numbersAdd using groups of 10 and 100Select strategies for adding within 100Break apart 2-digit addition problemsSubtract within 100 using a number lineAdd 2-digit numbers by making tensAddition word problems within 100Missing numbers in addition and subtractionAddition and subtraction with number linesAdding 2-digit numbers without regroupingAdding multiple 2-digit numbers word problemsSubtracting 1s using place valueSubtracting a 1-digit number with regroupingAddition word problem: horsesSubtracting 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 four two digit numbersAdding 53+17 by making a group of 10Subtraction word problem: crayons
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