2.CE.1.b
Apply strategies (e.g., the use of concrete and pictorial models, place value, properties of addition, the relationship between addition and subtraction) to determine the sum or difference of two whole numbers where addends or minuends do not exceed 100.
Khan Academy ResourcesSubtract within 100 using place value blocksAdd within 100 using place value blocksSubtract within 20Subtract within 20 visuallyAdd and subtract on the number line word problemsAdd within 100 using a number lineAdd & subtract within 20Subtraction word problems within 100Add within 20 visuallyFind the missing number (add and subtract within 100)Place value blocks within 1,0002-step addition word problems within 100Add 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 100Adding by making a group of 10Missing numbers in addition and subtractionAddition and subtraction with number linesAdding 2-digit numbers without regroupingSubtracting 1s using place valuePlace value tables within 1,000Subtracting a 1-digit number with regroupingAddition word problem: horsesSubtracting 10s using place valueMulti-step subtraction word problemUnderstanding 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 10Multi step addition word problem

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