Exploring Partial Differences in Subtraction

Mrs. Gorsky introduces the concept of partial differences, focusing on subtraction. She explains how to break down numbers by their place values to simplify subtraction. The video includes three examples: subtracting 26, 61, and 74, demonstrating mental math strategies and the use of charts to aid in subtraction. The tutorial encourages students to practice these techniques at home.

What operation is focused on when discussing differences?

• Multiplication

• Division

• Addition

• Subtraction

What is the value of two tens?

• 200

• 20

• 2

• 10

What combination of numbers adds up to 6, including the number 4?

• 2 and 4

• 4 and 2

• 3 and 3

• 1 and 5

What is the final difference in the first example?

• 32

• 28

• 26

• 30

In the second example, what is subtracted first from 61?

• 40

• 47

• 1

• 7

What is the final difference in the second example?

• 14

• 19

• 21

• 20

In the third example, what is the correct combination to match the ones place?

• 7 and 1

• 4 and 4

• 5 and 3

• 6 and 2

What is the first step in subtracting 28 from 74?

• Subtract 8 ones

• Subtract 20

• Subtract 2 tens

• Subtract 4 ones

What is the final difference in the third example?

• 44

• 50

• 48

• 46

What technique is emphasized for mastering subtraction?

• Partial differences

• Partial sums

• Traditional subtraction

• Multiplication for check