2.4.B
Add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations.
Khan Academy ResourcesSubtract within 100 using place value blocksAdd within 100 using place value blocksAdd within 100 using a number lineFind the missing number (add and subtract within 100)Adding up to four 2-digit numbers word problemsAdding 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 tensAddition word problems within 100Adding by making a group of 10Missing 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 10
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