Two-Digit Addition Strategies

This video tutorial covers the process of two-digit addition, focusing on regrouping when sums exceed ten in any place value. It provides step-by-step examples, explains the concept of place value, and offers practice problems. The tutorial also introduces higher-order thinking skills by identifying pairs of numbers whose sums exceed 100 without direct calculation. The lesson concludes with tips for organizing work and a preview of the next lesson on rewriting addition problems.

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

• Add the tens and regroup if needed

• Add the ones and regroup if needed

• Multiply the digits

• Subtract the ones and tens

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding 27 and 6, what do you do after finding the sum of the ones place?

• Add the tens and regroup if needed

• Subtract the tens

• Multiply the ones

• Divide the tens

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CCSS.2.NBT.B.6

In the example of 97 plus 6, what is the result after regrouping the tens?

• Eighty-nine

• One hundred and six

• Ninety-seven

• One hundred and three

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the sum of 78 and 54 after regrouping?

• 132

• 91

• 112

• 103

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CCSS.1.NBT.C.5

How many tens are there in the sum of 89 and 17?

• Nine tens

• Seven tens

• Ten tens

• Eight tens

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Which of the following pairs will have a sum greater than 100?

• 58 and 76

• 30 and 20

• 40 and 15

• 25 and 50

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CCSS.1.NBT.C.5

What is a quick way to determine if a sum will be greater than 100?

• Subtract the tens

• Add the ones

• Multiply the digits

• Add the tens

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CCSS.2.NBT.B.7

What is a useful tip for keeping place values aligned when doing addition?

• Use a ruler

• Turn the paper sideways

• Use a calculator

• Write in cursive

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CCSS.2.NBT.A.3

What can you use to label columns for hundreds, tens, and ones?

• H, T, O

• A, B, C

• X, Y, Z

• 1, 2, 3

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CCSS.3.OA.C.7

What will the next lesson focus on?

• Rewriting two-digit addition problems

• Subtracting two-digit numbers

• Multiplying two-digit numbers

• Dividing two-digit numbers

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CCSS.3.OA.C.7