Subtraction Strategies and Techniques

The video tutorial teaches second graders how to subtract three-digit numbers using three different strategies: base ten blocks, place value, and number line. Each method is explained step-by-step, demonstrating how to handle situations where regrouping is necessary. The tutorial emphasizes flexibility in problem-solving and encourages students to use multiple strategies to verify their answers.

What is the first step in the Base Ten strategy for subtracting three-digit numbers?

• Convert all numbers to ones.

• Add the numbers together first.

• Draw the larger number using base ten blocks.

• Subtract the hundreds directly.

In the Base Ten strategy, what do you do if there aren't enough ones to subtract?

• Skip the subtraction of ones.

• Add more ones from another number.

• Subtract the tens first.

• Unbundle a ten into ten ones.

How do you handle a lack of tens in the Base Ten strategy?

• Subtract the hundreds first.

• Skip the subtraction of tens.

• Add more tens from another number.

• Unbundle a hundred into ten tens.

What is the main idea behind the Place Value strategy?

• Breaking down numbers into hundreds, tens, and ones.

• Using a calculator to find the answer.

• Subtracting numbers without breaking them down.

• Adding numbers before subtracting.

In the Place Value strategy, how is the number 157 broken down?

• 50 and 107

• 157 and 0

• 100 and 57

• 150 and 7

What is the purpose of using a number line in subtraction?

• To visualize subtraction through jumps.

• To multiply numbers easily.

• To divide numbers into smaller parts.

• To add numbers visually.

How does the Number Line strategy help in subtraction?

• By providing exact answers without calculation.

• By showing the addition of numbers.

• By visualizing the subtraction process with jumps.

• By converting numbers into fractions.

What is the final step in the Number Line strategy?

• Subtracting the hundreds.

• Multiplying the result by ten.

• Finding a friendly ten.

• Adding the numbers back.

What is the learning target of the lesson?

• To multiply three-digit numbers.

• To divide three-digit numbers.

• To add three-digit numbers.

• To subtract three-digit numbers.

What should students do if they have questions about the strategies?

• Search online for answers.

• Ask the teacher or send an email.

• Ignore their questions.

• Wait until the next class.