Respuesta :
15-8=7
10-8=2
2+5=7
so you take away the 5 in 15 the subtarct 10-8=2 then you take the extra 5 the add 5+2=7 then you have the anwer
10-8=2
2+5=7
so you take away the 5 in 15 the subtarct 10-8=2 then you take the extra 5 the add 5+2=7 then you have the anwer