Mastering 3-Digit Addition with Regrouping

The video tutorial teaches second graders how to perform three-digit addition with regrouping. It begins with an introduction to the concept, followed by three examples: 138 + 245, 124 + 59, and 127 + 145. Each example uses base 10 blocks to visually demonstrate the regrouping process. The tutorial also introduces an alternative method for solving the problems without pictures. The video concludes with encouragement and a reminder of the different strategies available for solving addition problems.

What is the first step in three-digit addition with regrouping?

• Start in the hundreds column

• Start in the tens column

• Start in the ones column

• Start in any column

When do we need to regroup in three-digit addition?

• When there are 5 or more ones

• When there are 20 or more ones

• When there are 10 or more ones

• When there are 15 or more ones

How many ones are there in the sum of 138 and 245 before regrouping?

• 15

• 13

• 10

• 8

After regrouping the ones in 138 + 245, how many tens are there?

• 8

• 9

• 7

• 6

What is the sum of 138 and 245?

• 403

• 393

• 383

• 373

How many ones are there in the sum of 124 and 59 before regrouping?

• 12

• 13

• 10

• 9

After regrouping the ones in 124 + 59, how many tens are there?

• 7

• 9

• 8

• 6

What is the sum of 124 and 59?

• 173

• 203

• 183

• 193

What is the sum of 127 and 145?

• 292

• 272

• 262

• 282

What is an alternative method to solve three-digit addition without pictures?

• Using a calculator

• Using mental math

• Using a number line

• Writing the numbers and adding column by column