Exploring Subtraction Across Zeros

The video tutorial introduces the concept of subtracting across zeros, building on students' existing skills in subtraction with regrouping. It provides a detailed example of how to handle subtraction when zeros are involved, using a step-by-step approach. The tutorial also introduces the Box Trick, a method to simplify the process of subtracting across zeros. Finally, students are given a practice problem to solve on their own and a riddle to ponder.

Where should you start when subtracting numbers?

• At the highest value column

• In the ones column

• In the hundreds column

• In the tens column

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CCSS.2.NBT.B.7

What should you do if you cannot subtract due to a zero in the ones place?

• Skip the subtraction

• Borrow from the next non-zero column

• None of the above

• Start from a different column

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CCSS.2.NBT.B.7

What is the result of subtracting 7 from 10?

• 4

• 3

• 5

• 2

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CCSS.1.OA.C.6

What is the Box trick used for in subtraction?

• To simplify borrowing across zeros

• To divide numbers

• To add numbers

• To multiply numbers

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CCSS.5.NBT.B.7

What should you do if you encounter zeros while subtracting?

• Only subtract non-zero numbers

• Ignore the zeros

• None of the above

• Use the Box trick

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CCSS.6.NS.B.3

What do you do after applying the Box trick and getting a new number?

• Repeat the Box trick

• None of the above

• Subtract the numbers as usual

• Convert the number to a higher base

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CCSS.1.NBT.C.4

CCSS.2.MD.B.6

What is the final step after using the Box trick and subtracting the numbers?

• Repeat the subtraction

• Check the result by addition

• All of the above

• Start a new problem

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CCSS.2.NBT.B.7

What is the result of 10 minus 7 using the Box trick?

• 7

• 3

• 4

• 2

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CCSS.2.OA.A.1

How do you verify your subtraction result?

• By division

• By addition

• By multiplication

• By subtraction

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CCSS.1.OA.A.1

What is the practice problem given at the end of the video?

• 500 minus 329

• 400 minus 123

• 300 minus 210

• 200 minus 111