Adding and Subtracting Three-Digit Numbers

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What is a three-digit number?

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A three-digit number is a number that has three digits, ranging from 100 to 999.

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CCSS.2.NBT.A.3

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What does it mean to add numbers?

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Adding numbers means finding the total or sum by combining two or more numbers.

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CCSS.5.NBT.B.7

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What does it mean to subtract numbers?

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Subtracting numbers means finding the difference by taking one number away from another.

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CCSS.1.OA.A.1

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What is the sum of 678 and 432?

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1110

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

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What is the difference between 876 and 543?

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333

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

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What is the result of subtracting 567 from 890?

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323

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

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What is the sum of 456 and 321?

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777

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

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How do you check your addition?

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You can check your addition by adding the numbers again or by using subtraction to see if the total matches.

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CCSS.1.OA.A.1

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How do you check your subtraction?

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You can check your subtraction by adding the difference to the smaller number to see if it equals the larger number.

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CCSS.1.OA.A.1

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What is regrouping in addition?

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Regrouping in addition is when you carry over a value to the next column when the sum exceeds 9.

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CCSS.2.NBT.B.5