Exploring 2nd Grade Math Concepts in Lesson 12.5

In this lesson, students learn to add two-digit numbers with a focus on regrouping. The teacher introduces the learning objective and guides students through solving problems involving addition and regrouping. The lesson includes examples with blocks and numbers, emphasizing the importance of starting with the ones place and regrouping when necessary. Students are encouraged to check their understanding with additional practice problems.

What is the first step when adding two-digit numbers as discussed in the video?

• Start with the ones place

• Add the tens place first

• Multiply the largest digit

• Subtract the smaller number from the larger

Tags

CCSS.2.NBT.B.7

If Omar uses 36 blocks and Lauren uses 27 more, how many blocks does Lauren use?

• 27 blocks

• 63 blocks

• 36 blocks

• 13 blocks

Tags

CCSS.1.OA.A.1

What does regrouping mean in the context of addition?

• Adding numbers from different groups

• Dividing the sum by 10

• Rearranging the numbers

• Carrying over a ten when the sum exceeds 9

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

After regrouping 13 ones, how many tens and ones do we get?

• 3 tens and 1 one

• 2 tens and 3 ones

• 1 ten and 4 ones

• 1 ten and 3 ones

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the sum of 36 blocks and 27 blocks?

• 53 blocks

• 63 blocks

• 73 blocks

• 83 blocks

Tags

CCSS.2.OA.A.1

When adding 49 and 38, what is the sum of the ones place before regrouping?

• 7

• 12

• 15

• 17

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the final sum when adding 49 and 38?

• 97

• 107

• 87

• 77

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the problem 36 plus 57, what is the sum after regrouping?

• 103

• 93

• 83

• 113

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the sum of the tens place in the problem 49 plus 38 after regrouping?

• 10

• 7

• 9

• 8

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the review problem, if you start with the ones place and have 4 plus 5, what do you need to do next?

• Subtract

• Add the tens place

• Regroup

• None of the above

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5