multiply numbers with regrouping
20x5
100
2x2
4
243+532
775
42+2
44
2-2
0
30x6
180
4x4
16
320+230
550
44+6
110
33-20
13
20 x 6
120
5x6
30
240+240
480
45+2
47
13-10
3
22x5
110
6x6
36
420+332
752
52+20
72
20-10
10
63x4
252
7x7
49
700+220
920
52+52
104
330-20
310