Show:
2x2 multiplication
2x1 multiplication
single digit multiplication
100

11x11

121

100

13x2

36

100

2x2

4

200

12x12

144

200

12x7

84

200

4x4

16

300

18x12

216

300

32x3

96

300

8x4

32

400

33x27

891

400

32x3

96

400

5x7

35

500

69x13

897

500

85x3

255

500

9x9

81