142÷2=115÷5=
6-5= 10-5= 4+3=2+2= 2+1= 6-5=
8+2= 7-5= 7+2=10-10= 9-9= 1+1=
10-3= 6+1= 9+1= 8-3= 9-6= 4+3=
5-5= 6+0= 7-7= 4+0= 9+0= 10-9=
7-0= 6-0= 7-7= 4-0= 9-0= 10-9=