Mastering 2-Digit Addition Techniques

This video tutorial teaches how to add two-digit numbers with and without regrouping. It explains the concept of regrouping, provides examples of addition with and without regrouping, and offers practice problems. Key points include starting addition from the ones place and regrouping when the sum is 10 or more. The tutorial emphasizes the importance of practice to master the skill.

What does regrouping in addition mean?

• Combining numbers to make a group of 10 when the sum is 10 or more.

• Separating a number into individual digits.

• Adding numbers without carrying over to the next place value.

• Subtracting one number from another.

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CCSS.2.NBT.B.7

Why do we start adding from the ones place?

• Because it's easier to calculate.

• To ensure we correctly identify the need to regroup.

• It's a random choice without specific reason.

• To avoid making mistakes in subtraction.

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CCSS.2.NBT.B.7

What is the first step in adding two-digit numbers?

• Regrouping the numbers.

• Adding the ones place.

• Adding the tens place.

• Drawing a place value chart.

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What is the result of adding 43 and 17 using regrouping?

• 50

• 60

• 70

• 80

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many tens are there after adding 43 and 17?

• 7

• 6

• 5

• 8

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CCSS.1.NBT.C.4

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In the addition of 75 and 12, why was there no need to regroup?

• Because the sum of the ones place was less than 10.

• Because the sum was exactly 10.

• Because both numbers were even.

• Because the sum exceeded 100.

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CCSS.2.NBT.B.7

What does the sum of 75 and 12 equal?

• 87

• 107

• 77

• 97

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CCSS.1.NBT.C.4

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What is the sum of 55 and 29?

• 74

• 84

• 94

• 104

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CCSS.2.NBT.B.7

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When adding 61 and 18, is regrouping necessary?

• No, because the numbers are too large.

• Yes, always in two-digit addition.

• No, because the sum of the ones place is less than 10.

• Yes, because the sum of the ones place is more than 10.

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What key point should be remembered when adding two-digit numbers?

• Always start with the tens place.

• Regrouping is not necessary.

• Always start with the ones place.

• Use subtraction for easier calculation.

Tags

CCSS.2.NBT.B.7