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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 100 on the number lineGet 5 of 7 questions to level up!

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

Practice

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

Practice

Estimate to subtract multi-digit whole numbersGet 3 of 4 questions to level up!

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Subtraction by breaking apartAdding and subtracting on number lineMethods for subtracting 3-digit numbers

Practice

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!

Select strategies for subtracting within 1000Get 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)

Practice

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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Find the missing number (add and subtract within 1000)Get 3 of 4 questions to level up!

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Three digit addition word problemsThree digit subtraction word problems

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Add and subtract within 1000 word problemsGet 3 of 4 questions to level up!