This video tutorial explains how to add two-digit numbers both without and with regrouping. Using a scenario of collecting rocks, the instructor demonstrates the process of aligning numbers correctly and adding them step-by-step. The video covers the concept of regrouping when the sum of the ones column exceeds ten, illustrating how to carry over to the tens column. The tutorial concludes with a brief mention of an upcoming video on double-digit subtraction.

What is the total number of rocks collected after the first addition?

• 12 rocks

• 62 rocks

• 25 rocks

• 37 rocks

Tags

CCSS.2.OA.A.1

How many tens are there in the number 25?

• 1 ten

• 5 tens

• 3 tens

• 2 tens

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the result of adding the ones in the numbers 25 and 12?

• 2 ones

• 7 ones

• 10 ones

• 5 ones

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What represents a 'ten' in the video?

• A cube

• A rod

• A circle

• A stone

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the sum of the tens column in the first addition example?

• 5 tens

• 1 ten

• 3 tens

• 2 tens

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What do you do when the sum of the ones column is greater than 9?

• Ignore the extra

• Carry over to the tens column

• Start over

• Only count the ones

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

After regrouping, how many ones are left when adding 7 ones and 5 ones?

• 10 ones

• 12 ones

• 2 ones

• 3 ones

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many new stones did the teacher find on the last day?

• 62 stones

• 12 stones

• 37 stones

• 25 stones

Tags

CCSS.2.OA.A.1

What is the final total of rocks collected after both additions?

• 62 rocks

• 37 rocks

• 25 rocks

• 99 rocks

Tags

CCSS.2.OA.A.1

How many tens are added together in the final addition example?

• 4 tens

• 5 tens

• 3 tens

• 6 tens

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5