3-Digit Subtraction with an Open Number Line

The video tutorial demonstrates how to use an open number line to solve a three-digit subtraction problem. The instructor begins with the problem 486 - 234 and explains the process step-by-step. First, 200 is subtracted from 486, resulting in 286. Next, 30 is subtracted, bringing the total to 256. Finally, 4 ones are subtracted to reach the final answer of 252. The tutorial emphasizes the use of an open number line to simplify the subtraction process.

What is the first step in using an open number line to solve a three-digit subtraction problem?

• Adding the tens

• Adding the hundreds

• Subtracting the hundreds

• Subtracting the tens

Tags

CCSS.2.NBT.B.7

After subtracting 200 from 486, what is the next step?

• Jump back 50

• Jump back 30

• Jump back 40

• Jump back 20

Tags

CCSS.2.NBT.B.8

What is the result of 486 minus 200?

• 286

• 386

• 486

• 186

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the result of 286 minus 30?

• 276

• 246

• 266

• 256

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the final answer after subtracting 4 ones from 256?

• 248

• 254

• 252

• 250

Tags

CCSS.2.NBT.B.7