The video introduces the 'Keep a Constant Difference' subtraction strategy, emphasizing its role in simplifying subtraction by maintaining the difference between numbers. It highlights the importance of understanding subtraction as finding a difference and suggests prior experience with regrouping. The strategy is demonstrated with examples, showing how it can eliminate the need for regrouping, making subtraction easier. The video concludes with recommendations for practice and transitioning to mental math.

What is the primary concept students must understand before using the 'Keep a Constant Difference' strategy?

• Division of numbers

• Addition of numbers

• Multiplication of numbers

• Finding the difference between two numbers

In which grades is the 'Keep a Constant Difference' strategy primarily taught?

• Grades 9 through 12

• Grades 6 through 8

• Grades 3 through 5

• Grades 1 through 2

How does the 'Keep a Constant Difference' strategy simplify subtraction problems?

• By adding numbers

• By multiplying numbers

• By dividing numbers

• By modifying both numbers by the same amount

What is the result of shifting both numbers in the subtraction problem 8 - 4 by one?

• 6 - 2

• 9 - 5

• 7 - 3

• 10 - 6

When using the 'Keep a Constant Difference' strategy, what happens to the difference between the numbers?

• It increases

• It decreases

• It remains the same

• It becomes zero

In the example 22 - 8, what is the new problem after shifting both numbers up by two?

• 21 - 7

• 24 - 10

• 23 - 9

• 25 - 11

What is the benefit of using number lines when introducing the 'Keep a Constant Difference' strategy?

• To make addition easier

• To visualize the shift in numbers

• To practice multiplication

• To learn division

What should be the focus when teaching the 'Keep a Constant Difference' strategy to students?

• Memorizing subtraction facts

• Practicing addition

• Understanding number relationships

• Finding the answer quickly

What is the ultimate goal of practicing the 'Keep a Constant Difference' strategy?

• To use calculators

• To develop mental math skills

• To rely on paper and pencil

• To avoid subtraction

What should be removed once students are comfortable with the 'Keep a Constant Difference' strategy?

• Number lines and dry erase boards

• Textbooks

• Calculators

• Worksheets