Exploring Addition of Ones and Tens

This video tutorial teaches how to add two-digit numbers by breaking them into ones and tens. It provides multiple examples, starting with using physical materials to visualize the addition process and then moving to mental math. The tutorial covers adding numbers like 23 and 32, 36 and 11, 27 and 12, and 72 and 23, emphasizing the importance of understanding the composition of numbers in terms of tens and ones.

What is the sum of 23 and 32?

• 45

• 75

• 65

• 55

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding 23 and 32, what is the sum of the ones?

• 5

• 9

• 7

• 3

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding two-digit numbers, what is the first step according to the video?

• Subtract the smaller number from the larger one

• Add the tens

• Multiply the numbers

• Add the ones

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the result of adding 36 and 11?

• 47

• 57

• 67

• 37

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the addition of 36 and 11, how many tens are there in the final sum?

• 5

• 4

• 6

• 3

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the sum of 27 and 12?

• 29

• 49

• 59

• 39

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding 27 and 12, what is the sum of the ones?

• 7

• 5

• 11

• 9

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the final sum when adding 72 and 23?

• 105

• 95

• 75

• 85

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the addition of 72 and 23, what is the sum of the tens?

• 70

• 90

• 110

• 50

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many ones are there when adding 72 and 23?

• 3

• 7

• 5

• 9

Tags

CCSS.2.NBT.B.7