Double Digit Addition

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What is double digit addition?

Back

Double digit addition is the process of adding two numbers that each have two digits, such as 23 + 45.

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

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What are partial sums?

Back

Partial sums are the sums of parts of a number that help in adding larger numbers. For example, in 45 + 11, you can break it into 45 + 10 + 1.

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CCSS.2.NBT.B.7

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How do you break apart numbers for addition?

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You can break apart numbers by separating them into tens and ones. For example, 56 can be broken into 50 and 6.

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CCSS.2.OA.A.1

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What is the sum of 70 + 10 + 6?

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The sum is 86.

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CCSS.2.NBT.B.5

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What is 45 + 11?

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The answer is 56.

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CCSS.2.NBT.B.5

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What is 45 + 4?

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The answer is 49.

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CCSS.2.NBT.B.6

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What is 10 + 32?

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The answer is 42.

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CCSS.2.NBT.B.5

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What are the partial sums of 20 + 13?

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The partial sums are 20 and 13.

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CCSS.2.NBT.B.7

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If you add 30 + 20, what is the result?

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The result is 50.

Tags

CCSS.2.NBT.B.5

Front

What is the first step in double digit addition?

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The first step is to align the numbers by their place values.

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5