Expand and Trade Subtraction Strategy

Holly Russell, a second-grade teacher, demonstrates the expand and trade subtraction strategy from Everyday Math's Unit 9. She explains how to subtract using expanded form, starting with simple two-digit numbers and progressing to more complex three-digit examples. The video covers both scenarios where trading is and isn't necessary, providing a comprehensive understanding of the method.

What is the first step in the expand and trade subtraction strategy?

• Convert numbers to expanded form

• Directly subtract the numbers

• Add the numbers together

• Multiply the numbers

In the example 79 minus 34, what is the result of subtracting the tens place values?

• 60

• 40

• 30

• 50

What is the final result of 79 minus 34 using the expand and trade strategy?

• 65

• 55

• 35

• 45

When subtracting without borrowing, what do you do if the ones place has enough to subtract?

• Skip the subtraction

• Borrow from the tens place

• Add a group of ten

• Subtract directly

In the example 84 minus 56, why is borrowing necessary?

• The tens place is larger

• The numbers are equal

• The ones place is larger

• The ones place is smaller

What is the result of 14 minus 6 in the example 84 minus 56?

• 6

• 12

• 10

• 8

What is the final result of 84 minus 56 using the expand and trade strategy?

• 48

• 18

• 38

• 28

In the three-digit example, why is borrowing necessary from the hundreds place?

• The tens place is smaller

• The hundreds place is smaller

• The ones place is smaller

• The tens place is larger

What is the result of 150 minus 70 in the three-digit example?

• 70

• 60

• 80

• 90

What is the final result of 160 minus 77 using the expand and trade strategy?

• 103

• 93

• 83

• 73