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Addition and subtraction within 100

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Skip-counting by 5sCounting by 10s
Practice
Skip-count by 5sGet 5 of 7 questions to level up!
Skip-count by 10sGet 5 of 7 questions to level up!
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Adding 1 vs. adding 10Understanding place value when adding tensUnderstanding place value when adding onesAdding 1s and 10s guided practice
Practice
Add 1 or 10Get 5 of 7 questions to level up!
Add 1s or 10s (no regrouping)Get 5 of 7 questions to level up!
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Subtracting 1 vs. subtracting 10Subtracting 1s using place valueSubtracting 10s using place value
Practice
Subtract 1 or 10Get 5 of 7 questions to level up!
Subtracting 1s or 10s (no regrouping)Get 5 of 7 questions to level up!
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Adding 2-digit numbers without regrouping 1Adding 2-digit numbers without regrouping 2Breaking apart 2-digit addition problemsRegrouping to add 1-digit numberAdding by making a group of 10
Practice
Add 2-digit numbers (no regrouping)Get 5 of 7 questions to level up!
Break apart 2-digit addition problemsGet 3 of 4 questions to level up!
Regroup when adding 1-digit numbersGet 5 of 7 questions to level up!
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Subtracting 2-digit numbers without regrouping 1Subtracting two-digit numbers without regrouping (example 2)Subtracting a 1-digit number with regrouping
Practice
Subtract 2-digit numbers (no regrouping)Get 5 of 7 questions to level up!
Subtract 1-digit numbers with regroupingGet 5 of 7 questions to level up!
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Adding 53+17 by making a group of 10Adding by making a group of 10Strategies for adding 2-digit numbersAddition and subtraction with number lines
Practice
Add 2-digit numbers by making tensGet 3 of 4 questions to level up!
Add 2-digit numbers by making tens 2Get 3 of 4 questions to level up!
Select strategies for adding within 100Get 5 of 7 questions to level up!
Add and subtract using a number lineGet 3 of 4 questions to level up!
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Adding 2-digit numbers without regrouping 2Adding with regrouping
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Add within 100Get 5 of 7 questions to level up!
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Subtracting 2-digit numbers without regrouping 1Subtracting with regrouping (borrowing)
Practice
Subtract within 100Get 5 of 7 questions to level up!
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Adding and subtracting on number line word problemsSubtraction word problem: tennis ballsAddition word problem: horsesSubtraction word problem: snow Subtraction word problem: crayons
Practice
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Subtraction word problem: basketballAddition word problem: starfishAddition word problem: spots
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Missing numbers in addition and subtraction
Practice

About this unit

Learn to add and subtract two-digit numbers within 100.