3.1 Multiply by 10, 100, 1000

Multiply 2 digits by 10

​

Steps

• Find the basic fact

• Multiply the basic fact

• Add the correct amount of zero(s)

• Example: 20 x 90

• Basic fact: 2 x 9= 18

• Add two zeros

• = 1,800

Steps

• Find basic fact: 12 x 4

• Multiply basic fact: 12 x 4 = 48

• Add 1 zero

• 12 x 40 = 480

Practice!!

On your own

Multiple Choice

50 x 40

• 200

• 2,000

• 20,000

• 200,000

Multiple Choice

60 x 80

• 480

• 4,800

• 48,000

• 480,000

Multiple Choice

40 x 24

• 960

• 9,600

• 96,000

• 960,000

Multiple Choice

11 x 70

• 770

• 7,700

• 77,000

• 770,000

Multiple Choice

11 x 80

• 880

• 8,800

• 88,000

• 880,000

Multiple Choice

12 x 80

• 960

• 8,600

• 86,000

• 9,600

Multiple Choice

50 X 60 =

• 3000

• 300

• 350

• 3500

Multiple Choice

60 X 70 =

• 4000

• 4200

• 4800

• 420

Multiple Choice

600 X 3 =

• 18

• 180

• 1800

• 1600

Multiple Choice

50 X 20 =

• 100

• 120

• 1000

• 1200

Multiple Choice

90 X 80 =

• 7200

• 6400

• 720

• 7000

Multiple Choice

500 x 50 =

• 250

• 1000

• 2500

• 25,000

Multiple Choice

800 X 4 =

• 3200

• 3400

• 2400

• 320

Multiple Choice

600 X 40 =

• 240

• 24,000

• 2400

• 24

Multiple Choice

800 X 50 =

• 400

• 40,000

• 450

• 4000

Multiple Choice

900 X 300 =

• 2700

• 270

• 27,000

• 270,000