Three-Digit Addition Using the Standard Algorithm

The video tutorial teaches second-graders how to add three-digit numbers using the standard algorithm. It begins with a brief review of previously learned strategies, such as using the HTH art and expanded form. The teacher then explains the standard algorithm, demonstrating how to add numbers vertically and regroup when necessary. Two example problems are solved step-by-step to illustrate the process. The lesson concludes with instructions for students to practice on Seesaw.

What is the first step in adding three-digit numbers using the standard algorithm?

• Start with the hundreds

• Start with the tens

• Start with the ones

• Add all digits at once

What do we do if adding the tens results in a number greater than 9?

• Ignore and move to the hundreds

• Start over

• Regroup and carry over to the hundreds column

• Write the entire number in the tens column

How many tens make a hundred?

• 20

• 15

• 10

• 5

What is the result of adding 481 and 357 using the standard algorithm?

• 858

• 848

• 838

• 828

When adding 9 plus 9 in the tens column, what do we do with the 18?

• Split it between tens and hundreds

• Regroup 10 to the hundreds

• Write 18 in the tens column

• Ignore the extra 9

What is the sum of 100 plus 500 plus 100?

• 800

• 700

• 600

• 900

What is the final answer when adding 6 plus 3 in the ones column?

• 10

• 8

• 11

• 9

Using double facts, what is 7 plus 6?

• 15

• 13

• 12

• 14

After regrouping, where do we place the extra ten from the tens column?

• In the ones column

• In the tens column

• We subtract it

• In the hundreds column

What is the sum of 5 plus 4 in the ones column?

• 11

• 9

• 10

• 8