1. (vertical) 6,2,90,82, 1, 2,63,30
2.3/4=9/ 12 2/3=8/ 12
3. (Vertical) 6, 15, 10,10,8,18,24,28
4. Simultaneous× 4 simultaneous× 7 simultaneous× 3 simultaneous× 2
5.( 1) is not simple enough for (2). (3) Error
6. 1.2/3=6/9 5/9=5/9 2.2/7= 16/56 2/8= 14/56 3.7/6= 2 1/ 16 8/9= 16/ 18
4.3/5=6/ 10 3/2= 15/ 10 5.9/4=8 1/36 4/9= 16/36 6.7/ 12= 14/ 12 7/8=2 1/24