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Addition, subtraction, and estimation

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Rounding to the nearest 10 on the number lineRounding to the nearest 100 on the number lineRounding to nearest 10 and 100
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Round to nearest 10 or 100Get 3 of 4 questions to level up!
Round to nearest 10 or 100 challengeGet 3 of 4 questions to level up!
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Estimating when adding multi-digit numbers
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Estimate to add multi-digit whole numbersGet 3 of 4 questions to level up!
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Breaking apart 3-digit addition problemsAddition using groups of 10 and 100Adding and subtracting on number line
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Break apart 3-digit addition problemsGet 3 of 4 questions to level up!
Add using groups of 10 and 100Get 3 of 4 questions to level up!
Add on a number lineGet 3 of 4 questions to level up!
Select strategies for adding within 1000Get 3 of 4 questions to level up!
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Using place value to add 3-digit numbers: part 1Using place value to add 3-digit numbers: part 2Adding 3-digit numbers
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Add within 1000Get 3 of 4 questions to level up!
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Estimating when subtracting large numbers
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Subtraction by breaking apartAdding and subtracting on number lineMethods for subtracting 3-digit numbers
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Break apart 3-digit subtraction problemsGet 3 of 4 questions to level up!
Subtract on a number lineGet 3 of 4 questions to level up!
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Worked example: Subtracting 3-digit numbers (regrouping) Subtracting 3-digit numbers (regrouping) Worked example: Subtracting 3-digit numbers (regrouping twice)Worked example: Subtracting 3-digit numbers (regrouping from 0)
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Subtract within 1000Get 3 of 4 questions to level up!
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Missing number for 3-digit addition within 1000Missing number for 3-digit subtraction within 1000
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Three digit addition word problemsThree digit subtraction word problems
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