Adding and Subtracting Three-Digit Numbers

Front

What is addition?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

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CCSS.1.OA.A.1

Front

What is subtraction?

Back

Subtraction is the process of finding the difference between two numbers by taking one number away from another.

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CCSS.2.OA.A.1

Front

What is a three-digit number?

Back

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

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CCSS.2.NBT.A.3

Front

What is the sum of 345 and 278?

Back

623

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

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What is the sum of 567 and 321?

Back

888

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

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What is the difference between 543 and 287?

Back

256

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

Front

What is the sum of 456 and 321?

Back

777

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

Front

What is the sum of 789 and 234?

Back

1023

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

Front

How do you add three-digit numbers?

Back

Align the numbers by place value (hundreds, tens, units) and add each column starting from the right.

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

Front

How do you subtract three-digit numbers?

Back

Align the numbers by place value and subtract each column starting from the right, borrowing if necessary.

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CCSS.3.NBT.A.2

CCSS.2.NBT.B.7