Multiplying Bygroups of Ten

Which expression would you use to help you solve for 9 x 80?

• 9 x 8 x 10

• (9 + 8) x 10

• 9 x 8 x 9

• 8 x 7 x 10

• 81

• 18

• 810

• 8,100

• 40

• 400

• 4,000

• 40,000

• 80

• 800

• 8

• 60

56

5,600

1,500

560

• 56

• 5,600

• 1,500

• 560

• 3

• 30

• 300

• 3,000

• 12

• 1,200

• 800

• 80

• 300

• 1,100

• 30

• 3,000

• 21,000

• 10,000

• 21

• 2,100

• 140,000

• 1,400

• 14,000

• 140