subtraction
435-300=
135
100+25=
125
how many holes is 2/4
2 holes
12x2=
24
4/2=
2
867-508=
359
876+67=
943
how many holes is 6/18
3 holes
36x5=
170
12/2=
6
987-432=
555
99+6=
105
how many holes is 5/5
1 hole
6x6=
36
72/8=
9
9865-876=
8999
6897+45=
6944
how many holes is 5/10
2
456x3=
1368
5/5=
1
1000-456=
644
122222+1=
122223
how many holes is 12/48
4 holes
321x6=
1926
144/12=
12