Understanding Missing Number Additions

The video tutorial explains how to solve addition problems with missing numbers by working from right to left and using the carrying method. It provides step-by-step solutions to two problems, emphasizing the importance of checking the calculations to ensure accuracy.

What is the first step when solving additions with missing numbers?

• Guess the missing numbers

• Start from the leftmost column

• Start from the rightmost column

• Add all numbers together

Tags

CCSS.1.OA.A.1

If something plus 9 equals 5, what should you consider?

• The sum is incorrect

• The missing number is 5

• The missing number is 9

• They added to make 15 and carried a 1

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When 1 plus 9 plus 2 equals 12, what should you do next?

• Ignore the carry

• Write 12 in the answer

• Write 1 in the answer

• Carry over the 1 and write 2

Tags

CCSS.1.OA.D.8

How do you solve 1 plus 7 plus something equals 4?

• Add to make 4 and carry a 1

• The missing number is 6

• The missing number is 4

• Add to make 14 and carry a 1

Tags

CCSS.1.OA.D.8

What is the missing number in 8 plus something equals 17?

• 7

• 8

• 9

• 10

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the second problem, what should you do if 3 plus 9 equals 12?

• Write 12 in the answer

• Carry over the 1 and write 2

• Ignore the carry

• Write 1 in the answer

Tags

CCSS.1.OA.D.8

How do you solve 1 plus 6 plus something equals 2?

• Add to make 2 and carry a 1

• The missing number is 6

• The missing number is 5

• Add to make 12 and carry a 1

Tags

CCSS.1.OA.A.1

What is the result of 1 plus 5 plus 5?

• 13

• 10

• 11

• 12

Tags

CCSS.1.OA.A.1

If 1 plus 9 plus something equals 3, what should you consider?

• The missing number is 9

• The missing number is 3

• The sum is incorrect

• They added to make 13 and carried a 1

Tags

CCSS.2.OA.A.1

What should you do after filling out all the missing numbers?

• Guess the answers

• Check the addition to ensure it works

• Move to the next problem

• Erase and start over

Tags

CCSS.2.OA.A.1