K8 Worksheets

Adding 3-digit Numbers Worksheets

Can your kids tackle these 3-digit addition worksheets? First, let them find the sum of two three-digit numbers arranged in columns without regrouping, laying a solid foundation. Sharpen regrouping skills to solve problems involving numbers between 100 and 999. Foster flexible thinking with horizontal addition before finding the sums of three, four, and even five addends.

Adding 3-digit Numbers without Regrouping

Adding 3-digit Numbers without Regrouping 1
Worksheet 1 Answer Key

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Adding 3-digit Numbers without Regrouping 2
Worksheet 2 Answer Key

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Adding 3-digit Numbers with Regrouping

Adding 3-digit Numbers with Regrouping 1
Worksheet 1 Answer Key

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Adding 3-digit Numbers with Regrouping 2
Worksheet 2 Answer Key

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Adding 3-digit Numbers with Regrouping 3
Worksheet 3 Answer Key

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Adding 3-digit Numbers with Regrouping 4
Worksheet 4 Answer Key

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Adding 3-digit Numbers | Horizontal

Adding 3-digit Numbers | Horizontal 1
Worksheet 1 Answer Key

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Adding 3-digit Numbers | Horizontal 2
Worksheet 2 Answer Key

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Adding Three 3-digit Numbers

Adding Three 3-digit Numbers 1
Worksheet 1 Answer Key

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Adding Three 3-digit Numbers 2
Worksheet 2 Answer Key

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Adding Four 3-digit Numbers

Adding Four 3-digit Numbers
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Adding Five 3-digit Numbers

Adding Five 3-digit Numbers
Worksheet Answer Key

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