Fluently (efficiently, accurately, and flexibly) add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction (e.g. composing/decomposing by like base-10 units, using friendly or benchmark numbers, using related equations, compensation, number line, etc.).
Khan Academy ResourcesAdd and subtract on the number line word problemsSubtraction word problems within 1002-step subtraction word problems within 100Find the missing number (add and subtract within 100)Estimate to add multi-digit whole numbersAdd on a number line2-step addition word problems within 100Add within 1,000 using place value blocksSelect strategies for adding within 100Break apart 3-digit addition problemsAddition word problems within 100Breaking apart 3-digit addition problemsAdding and subtracting on number line word problemsAdding 10 or 100Adding 1s, 10s, and 100sSubtraction word problem: basketballAdding and subtracting on number lineAdding two digit numbers on a number lineAddition word problem: horsesMulti-step subtraction word problemSubtracting 1, 10, or 100Multi step addition word problemSubtraction word problem: crayons
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