Multiplying whole numbers:

20

100

20 x 20

400

200

20x40

800

300

20x80

1600

400

20x90

1800

500

20x100

2,000

30

100

30x20

600

200

30x30

900

300

30x40

1200

400

30x50

1500

500

30x300

9,000

40

100

40x40

1600

200

40x50

2000

300

40x60

2400

400

40x70

2800

500

40x800

32,000

50

100

50x50

not 100 its: 2500

200

50x60

3000

300

50x70

3500

400

50x100

5000

500

50x300

15,000

60

100

60x70

4200

200

60x80

4800

300

60X90

5400

400

60x100

6,000

500

60x4000

240,000