| 9 8 7 6 | | 1 2 3 4 | | 150 180 210 240 | | 6 6 4 3 | | 4 5 6 7 | | 84 102 120 138 | | 3 2 1 0 | x | 7 8 9 10 | = | 18 24 30 36 | | 0 -1 -2 -3 | | 10 11 12 13 | | -48 -54 -60 -66 |