3-Digit Subtraction and Regrouping Techniques

This video tutorial covers three-digit subtraction with regrouping, focusing on converting hundreds to tens when necessary. It provides multiple examples, including 326 - 171, 638 - 293, 516 - 462, and 319 - 284, demonstrating the step-by-step process of regrouping. The tutorial concludes with a real-world problem involving marbles, encouraging higher-order thinking. Key concepts include understanding the minuend, subtrahend, and difference, and recognizing when regrouping is necessary.

What is the process called when we change 100 into ten tens for subtraction?

• Partitioning

• Subtraction

• Regrouping

• Decomposition

What is the result of subtracting 171 from 326?

• 145

• 165

• 155

• 175

After regrouping, how many tens does 326 become when subtracting 171?

• 13 tens

• 10 tens

• 11 tens

• 12 tens

In the context of subtraction, what does the term 'minuend' refer to?

• The number being subtracted

• The total number of items

• The number from which another number is subtracted

• The result of the subtraction

What is the purpose of regrouping in subtraction?

• To increase the minuend

• To change the subtrahend

• To make subtraction easier

• To ensure there are enough units to subtract from

What is the difference when subtracting 293 from 638?

• 345

• 365

• 355

• 335

How many hundreds are left after subtracting 462 from 516?

• 3 hundreds

• 0 hundreds

• 1 hundred

• 2 hundreds

What is the final step in subtraction before finding the difference?

• Regrouping the ones

• Crossing out the hundreds

• Adding the tens

• Subtracting the subtrahend

How many marbles are in the blue bag if there are 128 in the red bag and 285 in total?

• 167 marbles

• 147 marbles

• 157 marbles

• 137 marbles

Which bag contains more marbles, the red or the blue?

• Red bag

• Blue bag

• Both contain the same

• Cannot be determined