2.N.4.b

Add and subtract within 100 strategies based on place value including properties of operations, relationships between addition and subtraction, and algorithms.

Khan Academy Resources
Subtract within 100 using place value blocksAdd within 20Add within 100 using place value blocksAdd within 100 using a number lineSubtraction word problems within 100Subtract within 1,000 using place value blocksSubtract on a number lineAdd within 20 visuallyFind the missing number (add and subtract within 100)Adding up to four 2-digit numbers word problemsSubtract 10s and 100s (no regrouping)Adding up to four 2-digit numbersAdd within 1,000 using place value blocksAdd using groups of 10 and 100Select strategies for adding within 100Break apart 3-digit addition problemsBreak apart 2-digit addition problemsSubtract within 100 using a number lineAdd 2-digit numbers by making tensAdd 10s and 100s (no regrouping)Addition word problems within 100Regrouping whole numbers: 675Subtracting 3-digit numbers (no regrouping)Adding 10 or 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 valueAddition using groups of 10 and 100Subtracting a 1-digit number with regroupingSubtracting 1s, 10s, and 100sSubtracting 10s using place valueUnderstanding place value when adding onesStrategies for adding 2-digit numbersAdding 3-digit numbers (no regrouping)Subtracting two-digit numbers without regroupingAdding with regroupingUnderstanding place value when adding tensSubtracting 1, 10, or 100Breaking apart 2-digit addition problemsAdding 53+17 by making a group of 10Multi step addition word problemSubtracting with place value blocks (regrouping)
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