6 x 7= 42
5 x 5 = 25
3 x 5 = 15
4 x 6 = 24
7 x 9= 63
5 x 8= 40
9 x 4= 36
6 x 6= 36
8 x 7 = 56
81: 9= 9
72: 8=9
54: 6 = 9
36: 4 = 9
45: 5 = 9
20: 4 = 5
49: 7 = 7
64: 8 = 8
45 – 21 = 24
61 – 9 = 52
73 – 22 = 51
452- 121 = 331
589 – 368 = 221
564 – 234 = 330
735- 512 = 223
817- 628= 189
364+ 346= 770
85 + 465= 550
316 + 324= 640
620+ 8 = 628
674+ 49 = 723
123+ X = 396