Show:
1 digit by 1 digit
2 digit by 2 digit
3 digit by 3 digit
4 digit by 4 digit
?
100

5 x 9

45

100

12 x  12

144

100

300 x 60

18000

100

4444 x 5555

24686420

100

555555 x 555555

3.086x10^11

200

6 x 5

30

200

12 x 8

96

200

100 x 300

30000

200

3030 x 3030

9180900

200

333 x 333

110889

300

3 x 8

24

300

12 x 12

144

300

900 x 500

450000

300

4445 x 555

24687530

300

545 x 545

297025

400

9 x 3

27

400

10 x 80

180

400

200 x 400

80000

400

3444 x 4444

15305136

400

566 x 566

320356

500

7 x 4

28

500

10 x 70

170

500

500 x  500

250000

500

9999 x 9999

99980001

500

55 x 66

3630