break the 7
3 x 7 is the same as
3 x 2 and 3 x 5
55 x 7
50 x 7 and 5 x 7
7 x 90 is the same as 5 + 90 and 2 + 90
5 x 90 and 2 x 90
6 x 7 is the same as
6 x 5 and 6 x 2
6 x 77
6 x 70 and 6 x 7
80 x 7 is the same as 5600
560 (80 groups of 7)
7 x 7 is the same as
7 x 5 and 7 x 2
57 x 16
77 x 7 is the same as 70 x 7
forgot the 7 x 7
8 x 7 is the same as
8 x 5 and 8 x 2
7 x 670
7 x 600 + 7 x 70
55 x 7 is the same as 50 x 5 and 5 x7
50 x 5 and 5 x 2