Exploring 2-Digit Addition Techniques

This video tutorial covers the process of two-digit addition, focusing on adding the ones first, regrouping if necessary, and then adding the tens. It provides multiple examples, including 18 + 16, 28 + 17, and others, to illustrate the steps involved. The tutorial also explores alternative methods like breaking apart addends and addresses problem-solving using addition and subtraction. The video concludes with test preparation tips and encourages students to practice more.

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

• Add the ones first

• Regroup the tens

• Subtract the ones

• Add the tens first

Tags

CCSS.2.NBT.B.6

When adding 18 + 16, what do you do after adding the ones place?

• Regroup ten ones as one ten

• Write the sum directly

• Add the ones again

• Subtract the tens

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the example 28 + 17, what is the sum of the ones place before regrouping?

• 10

• 12

• 18

• 15

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the result of adding 47 + 24?

• 81

• 71

• 61

• 91

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding 52 + 15, why is there no need to regroup?

• The sum of the ones place is less than 10

• The sum of the tens place is less than 10

• The sum of the tens place is more than 10

• The sum of the ones place is exactly 10

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the sum of 45 + 39 after regrouping?

• 74

• 84

• 94

• 104

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How do you add 27 + 36 using the alternative method?

• Subtract the ones, then add the tens

• Subtract the tens, then add the ones

• Add the ones first, then the tens

• Add the tens first, then the ones

Tags

CCSS.2.NBT.B.6

In the word problem, how many necklaces does Sarah have after selling 5?

• 56

• 51

• 46

• 41

Tags

CCSS.2.OA.A.1

What is the sum of 34 + 12 without regrouping?

• 50

• 48

• 46

• 44

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many rocks does Bob have after getting 26 more rocks?

• 90

• 85

• 80

• 75

Tags

CCSS.2.NBT.B.6