1. 921 * 8 = 7368
25290 : 6 = 4215
7368 - 4215 =3153
3153 : 3 =1051
1051 - 251 = 800
2. 23067 : 9 = 2563
55560 : 8 = 6945
2563 + 6945 = 9508
10 * 9508 = 95080
95080 :4 = 23770
3. 714 * 3 = 2142
2142 -1142 =1000
25428 : 4 = 6357
50382 : 9 = 5598
6357 - 5598 =759
1000 * 759 = 759000