Adding Two-Digit Numbers: With and Without Regrouping

Rachel Calf Love explains how to add two-digit numbers with and without regrouping. She demonstrates the process of adding numbers without regrouping by carrying over digits and then explains the regrouping method using parentheses to simplify the addition process. The video concludes with a summary of the methods discussed.

What is the first step in adding two-digit numbers without regrouping?

• Subtract the smaller number from the larger

• Multiply the two numbers

• Add the tens first

• Add the units first

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What do you do when the units' sum exceeds 9 in addition without regrouping?

• Ignore the carry over

• Subtract 10 from the sum

• Reset the units to zero

• Carry over the tens to the next column

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How do you represent 23 in the regrouping method?

• 200 + 30

• 23 + 0

• 20 + 3

• 2 + 3

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the sum of 20 and 40 in the regrouping method?

• 2040

• 10

• 70

• 60

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the result of adding 3 and 7 in the regrouping method?

• 3

• 11

• 37

• 10

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the final result of 23 plus 47 using regrouping?

• 70

• 100

• 67

• 60

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Why is regrouping considered easier for visualization?

• It simplifies multiplication

• It avoids addition altogether

• It separates tens and units

• It uses smaller numbers

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CCSS.7.NS.A.1C